A dilute aqueous solution of an organic compound soluble in water is formed by dissolving 2.35 g of the compound in water to form 0.250 L of solution. The resulting solution has an osmotic pressure of 0.605 atm at25∘CAssuming that the organic compound is a nonelectrolyte, what is its molar mass?

The rate of disappearance of the ClO₃⁻ ion is equal to 9.01 ×10⁻³ M/s.

The rate of reaction can be defined as the speed at which the products are produced or the reactants are consumed in a chemical reaction. The rate provides information about the time frame under which a reaction can be completed.

The rate of reaction can be described as the speed of a chemical reaction at which reactants are converted into products. Some reactions are instantaneous, while some take a little longer to reach the final equilibrium.

Given the chemical reaction is:

[tex]ClO_3^-(aq) + 9I^- (aq)+ 6 H^+ (aq) \longrightarrow 3I^{-3} (aq) + Cl^-(aq) + 3H_2O[/tex]

The initial rate of disappearance of I⁻ ion = 81.1 ×10⁻³ M/s.

The rate of disappearance of iodide ion is given by:

[tex]-\frac{D[I^-]}{Dt} =81.1\times 10^{-3}[/tex]

The relation between the rate of disappearance of I⁻ and ClO₃⁻ ion:

[tex]-\frac{D[ClO_3^-]}{Dt} =-\frac{1}{9} \frac{D[I^-]}{Dt}[/tex]

[tex]-\frac{D[ClO_3^-]}{Dt} =-\frac{1}{9} \times 81.1 \times 10^{-3}[/tex]

[tex]\frac{D[ClO_3^-]}{Dt} = 9.01 \times 10^{-3}M/s[/tex]

Therefore, the rate of the disappearance of ClO₃⁻ ion is equal to 9.01 ×10⁻³ M/s when the initial rate of disappearance of I⁻ is  81.1 ×10⁻³ M/s.

Learn more about the rate of reaction, here:

brainly.com/question/13571877

#SPJ2

Answer:

A

Explanation:

Autotrophs utilize the energy from  sunlight to reduce carbon dioxide to carbohydrates (glucose). The energy from the sunlight is used to split water into H+ and O2- and the H+ used in the reduction process. The labeled carbon in the carbon dioxide will, therefore, be incorporated by the autotrophs in the carbohydrates made in photosynthesis.  

The best Lewis symbol for oxygen in O2 is :O=O:, showing a double bond and octets for each oxygen atom. This structure, however, does not explain the paramagnetic properties of oxygen, which are due to unpaired electrons not depicted in the Lewis symbol.

The best Lewis symbol for oxygen, when considering the molecule O₂, is :O=O:. This Lewis structure indicates that there is an O=O double bond and each oxygen atom has eight electrons around it, satisfying the octet rule. However, this structure does not account for the paramagnetic properties of oxygen, which experimental studies have shown is due to the presence of two unpaired electrons in each oxygen molecule.

Because the Lewis structure of O₂ is expected to show all electrons as paired, there is a discrepancy with the observed magnetic behavior. Paramagnetism arises in molecules that have unpaired electrons, which is why liquid oxygen is attracted to magnetic fields despite the Lewis structure suggesting otherwise.

Answer:

2.5 × 10–5 M H3O+ and 4.0 × 10–10 M OH–

Explanation:

pH = - log[H3O+]

Therefore;

pH = - log[H3O+] = 4.6

Hence;

[H3O+]  = 10^-4.6

             = 2.51 ×10^-5 M

             = 2.5 ×10^-5 M

Additionally;

pH + pOH = 14

Thus; pOH = 14 -pH

                  = 14 -4.6

                  = 9.4

but; pOH = - log [OH-]

Therefore;

[OH-] = 10^-9.4

        = 3.98 × 10^-10 M

        =  4 × 10^-10 M

Answer:

2.5 × 10–5 M H3O+ and 4.0 × 10–10 M OH–

Answer:

1. Kindly, see the attached image.

2. 18.369 J.

3. Yes, the metal is pure silver.

Explanation:

1. Draw a graph of an exothermic reaction. Label reactants, products and ∆H.

2. Calculate the amount of energy required to raise the temperature of 3.00 g of gold from 45.9 to 93.0°C.

Q = m.c.ΔT.

Where, Q is the amount of energy required to raise the temperature of gold (J).

m is the mass of the gold (m = 3.0 g).

c is the specific heat of gold (c = 0.13 J/g.°C).

ΔT is the temperature difference between the initial and final T (ΔT = 93.0 °C - 45.9 °C = 47.1 °C).

∴ Q = m.c.ΔT = (3.0 g)(0.13 J/g.°C)(47.1 °C) = 18.369 J.

3. 1.70 g of a silvery metal requires 1000.0 J of energy to change its temp from 298 K to 2749 K. Is the metal pure silver?

As mentioned in details in the second point, we can use the relation:

Q = m.c.ΔT

Q = 1000.0 J, m = 1.70 g, ΔT = 2749 - 298 = 2451 °C.

∴ c = Q/(m.ΔT) = (1000.0 J)/(1.70 g)(2451 °C) = 0.239 J/g.°C ≅ 0.24 J/g.°C.

1) moles = mass/mR

CaCO3 Mr = 40 + 12 + (16×3)

= 52 + 48

= 100

mass = 15

so the moles would be 15 ÷ 100

which is 0.15 moles of CaCO3

2) moles = mass ÷ Mr

Mr of Al2O3 = 27 + (16×3)

= 27 + 48

= 75

mass = 204

so the moles would be 204/75 which is 2.72 moles of Al2O3

There are 0.15 moles in 15 grams of CaCO₃ and 2 moles in 204 grams of Al₂O₃.

To determine the number of moles in a given mass of a substance, you can use the formula:

 moles = mass (grams) / molar mass (g/mol)

We know the molar mass of CaCO₃ is 100 g/mol

(Ca: 40.0, C: 12.0, O: 16.0 × 3).

Given mass of CaCO₃ is 15 grams.

Apply the formula: moles = 15 g / 100 g/mol

                                           = 0.15 moles

We calculate the molar mass of Al₂O₃:

 Al: 27.0 × 2 = 54.0

O: 16.0 × 3 = 48.0

Total molar mass of Al₂O₃ = 54.0 + 48.0 = 102 g/mol

Given mass of Al₂O₃ is 204 grams.

Apply the formula: moles = 204 g / 102 g/mol = 2 moles

Complete question.

How many moles are there in :

The pressure would be 6000 Newton’s

The pressure of I when the system returns to equilibrium is 0.589 atm.

Equilibrium is defined as a state of a reversible chemical process in which there is no net change in the quantity of reactants and products.

To calculate the pressure we considered the equation

I2 -> 2Ig

Kp = I² / I2

     = (0.23)² / 0.21 = 0.25

I2 at initial = 2 x 0.21 = 0.42

I2 at equilibrium = 0.42 - x

Ig at initial = 2 x 0.23 = 0.46

Ig at equilibrium = 0.46 - 2x

Solving x using equilibrium constant

0.25 = (I)² / I2 = (0.46 + 2x)² / 0.42-x

0.25 (0.42 - x) = (0.46 + 2x)²

0.105 - 0.25x = 0.1764 + 4x²

-0.25 - 4x² = 0.1764 - 0.105

4.25 x² = 0.0714

x² = 0.714 / 4.25

x² = 0.0168

x = 0.129 atm

PI2 = 0.42 + 2x0.129

PI2 = 0.678 atm

PI = 0.46 + 0.129

PI = 0.589 atm

Thus, the pressure of I when the system returns to equilibrium is 0.589 atm.

To learn more about equilibrium, refer to the link below:

https://brainly.com/question/14480835

#SPJ2

Atoms that are bunched together the closest are solids.

A physical change occurs when something is altered. Such as cutting a piece of paper or chopping a piece of wood into pieces.  Melting ice, breaking glass, evaporating liquids are go through a physical change.

✯Hello✯

↪  You can see the setting changing around you

↪  You can feel a higher pressure/wind on your face

↪  There is adrenaline going through you

↪  (if this isnt the context you are looking for just comment)

❤Gianna❤

That will make a gold-202 nucleus.

Refer to a periodic table. The atomic number of mercury Hg is 80.

Step One: Bombard the [tex]\displaystyle ^{202}_{\phantom{2}80}\text{Hg}[/tex] with a neutron [tex]^{1}_{0}n[/tex]. The neutron will add 1 to the mass number 202 of [tex]^{202}_{\phantom{2}80}\text{Hg}[/tex]. However, the atomic number will stay the same.

[tex]^{202}_{\phantom{2}80}\text{Hg} + ^{1}_{0}n \to ^{203}_{\phantom{2}80}\text{Hg}[/tex].

Double check the equation:

Step Two: The [tex]^{203}_{\phantom{2}80}\text{Hg}[/tex] nucleus loses a proton [tex]^{1}_{1}p[/tex]. Both the mass number 203 and the atomic number will decrease by 1.

Refer to a periodic table. What's the element with atomic number 79? Gold Au.

[tex]^{203}_{\phantom{2}80}\text{Hg} \to ^{202}_{\phantom{2}79}\text{Au} + ^{1}_{1}p[/tex].

Double check the equation:

A gold-202 nucleus is formed.

Answer:

Explanation:

1) Chemical equation:

2) Oxidation states in the reactants

a) C₆H₁₂O₆

Here, you will see that the oxidation state of carbon in glucose is zero.

There are 6 atoms of C which may have different oxidation number.

You can work with a more developed formula such as:

     O    OH   OH    OH   OH  OH

     ║     |        |         |       |       |

H - C¹ -  C²  -  C³  -  C⁴ - C⁵  - C⁶ - H

             |        |         |       |       |

             H     H       H      H     H

        ∴ C¹ 's oxidation state may be determined from x + (−2) + (0) + (+1) = 0

            ⇒ x = + 1

       ∴ Their oxidation states are given by:

            x + (−1) + 2(0) + (+1) = 0 ⇒ x=0

        ∴ C⁶ 's oxidation state may be determined from:

             x + (−1) + (0) + 2(+1) = +1 ⇒ x = −1

b) O₂ : since it is alone, its oxidation state is zero.

3) Oxidation states in the products

c)  CO₂

d) H₂O

4) Changes in the oxidation state

5) Conclusion:

Answer:

C₆H₁₂O₆ is oxidized and O₂ is reduced.

Explanation:

Answer:

Question 1: 1) Increasing the pressure          C) Shift to the right

                   2) Removing hydrogen gas        A) Shift to the left  

                   3) Adding a catalyst                     B) No effect

Question 2: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: Shift it toward the reactants.

Question 4: Adding more of gas C to the system.

Question 5: It will shift toward the reactant side because the reactant side has one more mole of gas than the product side.

Question 6: True.

Question 7: there is no suitable choice is provided.

We can shift the equilibrium toward the right via:

Increasing N2O3 concentration,

decreasing NO and/or NO2 concentration,

decreasing the pressure,

lowering the T (cooling the system).

Explanation:

Question 1: Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).

Match Term Definition

Removing ammonia A) No effect

Removing hydrogen gas B) Shift to the left

Adding a catalyst C) Shift to the right

1) Increasing the pressure:

so, the right match is: C) Shift to the right.

2) Removing hydrogen gas:

so, the right match is: A) Shift to the left.

3) Adding a catalyst:

so, the right match is: B) No effect.

Question 2: Nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2NO2(g) ⇌ N2O4(g)

When the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. Which of the following conclusions about this equilibrium mixture is true?

So, the right choice is: This reaction is exothermic because the system shifted to the right on cooling.

Question 3: According to Le Châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

So, the right choice is: Shift it toward the reactants.

Note: The answer of Q 4, 5, 6 & 7 and all answers are in the attached word file.

These questions are based on Le Châtelier's principle and relate to the effects of changes in concentration, temperature, and pressure on chemical equilibrums. The reaction will always try to offset the disturbance by shifting towards the side that will help restore equilibrium.

The answers are based on Le Châtelier's principle, which states that equilibrium in a system will adjust to offset any changes made.

https://brainly.com/question/12099569

#SPJ3

= 1.23 moles

V1/n1 = V2/n2

V1 = 55 L, n1 =2.46 moles

1/2 of the gas was used and thus; 1/2 or 27.5 L remained.

Therefore;

55 L/2.46 moles = 27.5 L/ n2

n2 = (2.46 × 27.5)/55

    = 1.23 moles

The number of moles if 1/2 of the gas is used is mathematically given as

n2= 1.23 moles

Question Parameter(s):

a propane tank containing 55l

has 2.46 moles of the gas C3 is propane

Generally, the equation for the volume  is mathematically given as

V1/n1 = V2/n2

Therefore

55 L/2.46  = 27.5 L/ n2

n2 = (2.46 * 27.5)/55

n2= 1.23 moles

In conclusion, the number of moles

n2= 1.23 moles

Read more about volume

https://brainly.com/question/1578538

#SPJ2

The equation is:

3AgS2 +  4Al  ---> 2Al2S3 + 3Ag

Answer: The balanced chemical equation is written below.

Explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

[tex]A+BC\rightarrow AC+B[/tex]

The chemical equation for the reaction of silver sulfide with aluminium follows:

[tex]3Ag_2S+2Al\rightarrow 6Ag+Al_2S_3[/tex]

By Stoichiometry of the reaction:

3 moles of silver sulfide reacts with 2 moles of aluminium metal to produce 6 moles of silver metal and 1 mole of aluminium sulfide

Hence, the balanced chemical equation is written above.

Answer:

(D) Na₂SO₄•10H₂O (M = 286).

Explanation:

ΔTf = i.Kf.m,

Where, ΔTf is the depression in freezing point of water.

i is van't Hoff factor.

Kf is the molal depression constant.

m is the molality of the solute.

(A) CuSO₄•5H₂O:

CuSO₄ is dissociated to Cu⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(B) NiSO₄•6H₂O:

NiSO₄ is dissociated to Ni⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(C) MgSO₄•7H₂O:

MgSO₄ is dissociated to Mg⁺² and SO₄²⁻.

So, i = dissociated ions/no. of particles = 2/1 = 2.

(D) Na₂SO₄•10H₂O:

Na₂SO₄ is dissociated to 2 Na⁺ and SO₄²⁻.

So, i = dissociated ions/no. of particles = 3/1 = 3.

∴ The salt with the high (i) value is Na₂SO₄•10H₂O.

So, the highest ΔTf resulted by adding Na₂SO₄•10H₂O salt.

Answer: option C. in a solution that is 0.20 M in KNO₃.

Explanation:

This question deals with the common ion effect.

Any presence in a solution of a common ion with the solute will decrease its solubility and here you can find why.

AgCl (silver chloride) is highly insoluble in water.

Its solubility equation is given by this equilibrium equation:

  AgCl(s)  ⇄  Ag⁺(aq)  +  Cl⁻(aq)

The constant for this equilibrim is called constant of solubility product and is indicated as Ksp:

Then, any increase of the product ions (on the right side of the equilibrium equation), will result, according to Le Chatelier's principle in a shift of the equilibrium toward the left side, this is in an increase of the AgCl(s), meaning that less AgCl will be soluble.

Let's see in which of the given solutions is AgCl most soluble

A. Solution 0.20 M in CaCl₂

CaCl₂ is a ionic compound which also ionizes in solution, given Ca²⁺ and Cl⁻ ions. So, you can see that it will increase the concentration of Cl⁻, which means that the equlibrium  AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq), will be shifting to the left, decreasing the solubility of silver chloride.

B. Solution 0.20 M in AgNO₃

AgNO₃ is also a ionic salt which dissociates in water giving Ag⁺ and NO₃ ions. So, it will increase Ag⁺ ions, also shifting the equilibrium AgCl(s) ⇄ Ag⁺(aq) + Cl⁻(aq) to the left, decreasing the solubility of silver chloride.

C. Solution 0.20 M in KNO₃

Since KNO₃ has no common ions with AgCl, it will not affect the equilibrium equation in the same manner and you can expect that AgCl is most soluble in KNO₃.

AgCl is most soluble in the 0.20 M KNO3 solution because it does not provide common ions to AgCl, thus avoiding the reduction of AgCl's solubility due to the common ion effect.

The solubility of AgCl (silver chloride) in various solutions can be affected by the common ion effect. However, due to the formation of a two-coordinate complex with chloride ions, AgCl₂⁻, AgCl's solubility in solutions can differ from what the common ion effect alone would predict. The given information states that AgCl is approximately 10 times more soluble in 1.0 M KCl than in pure water, despite the common ion effect suggesting it should be much less soluble.

Given the choices of:

AgCl would be most soluble in the solution that does not contain a common ion with AgCl. Because CaCl₂ and KNO₃ are both salts with different ions than Ag+ and Cl−, they would not directly provide a common ion that would decrease the solubility of AgCl through the common ion effect. Whereas the AgNO₃ solution contains Ag+ ions which would vastly decrease the solubility of AgCl due to the common ion effect. Therefore, the AgCl is most soluble in the 0.20 M KNO₃ solution (Choice C), because it does not supply any common ions that could reduce its solubility.

https://brainly.com/question/31598456

#SPJ2

The number of valence electrons influences whether an atom will gain or lose electrons during compound formation, following the octet rule. Metals typically lose electrons to form cations, while nonmetals gain electrons to form anions. This behavior underpins the formation of ionic and covalent bonds.

The number of valence electrons in an atom is fundamentally related to its tendency to gain or lose electrons during compound formation, adhering to the octet rule. Atoms seek to complete their outermost electron shell, typically aiming to have eight electrons in this valence shell for stability, mirroring the electron configuration of the nearest noble gas. Metals often lose electrons to form positively charged ions (cations), while nonmetals tend to gain electrons, forming negatively charged ions (anions). This transfer and sharing of electrons give rise to different types of chemical bonds, primarily ionic and covalent, which are pivotal in the formation of compounds. The electrostatic attraction between oppositely charged ions in ionic bonding, and the sharing of electrons in covalent bonding, exemplify the underlying principles driving atoms to gain or lose electrons for compound formation.

When a halogen combines with hydrogen, a covalent molecule is formed.

When a halogen, such as chlorine (Cl), fluorine (F), bromine (Br), or iodine (I), combines with hydrogen (H), they typically form covalent molecules. In covalent bonding, atoms share electrons to achieve a stable electron configuration. Halogens have one electron missing in their outermost electron shell, while hydrogen needs one more electron to complete its shell. To satisfy these electron needs, they share electrons through a covalent bond.

In hydrogen chloride (HCl), hydrogen shares its electron with chlorine, forming a covalent bond. This sharing allows both atoms to achieve a stable electron configuration. Covalent molecules, in contrast to ionic compounds, involve the sharing of electrons rather than the transfer of electrons, resulting in the formation of discrete molecules with relatively low melting and boiling points.

To know more about hydrogen, here

https://brainly.com/question/31018544

#SPJ12

Answer:

a) The charge of one electron is the same charge of another electron.

b) The charge of one electron  has the same magnitude and opposite sign as the charge of a proton. The charge of an electron is negative by convention and the charge of a proton is positive by convention.

c) The mass of a proton is about 1,836 times the mass of an electron.

Explanation:

1) Electron discovery is due to J.J Thompson who is responsible for the famous experiment of the cathode-rays tube.  J.J Thompson, in 1897, found that cathode rays could be deflected by an electric field. He could establish that electrons had negative charge, and also determined the approximate the ratio of its charge to the mass. Yet, he could not determine such magnitudes.

2) Later on, Ernest Rutherford,  with the famous gold foil experiment, found that all of the positive charge (proton) and essentially all of the mass of the atom is concentrated in a tiny region which he named the nucleus.

3) Since, the atom has the same number of electrons and protons, and it is neutral, the charge magnitude of the charges electrons and protons are equal.

4) Robert Millikan, 1908 - 1917, was able to determine the charge of the electron, with which the mass was also determined.

The accepted relative values for the subatomic particles are:

Particle   Relative mass Relative charge

Proton           1                              +1

Neutron        1                                0

Electron        1/ 1,836                    -1

Answer:

all electrons have same charge. Electron is equal and opp to proton

Protean mass of electron

Explanation:

The increase in temperature when solid X is added to solution Y indicates an exothermic reaction, and the further increase with additional solid could be due to supersaturation, the disturbance of equilibrium, and additional exothermic reactions.

When solid X is added to solution Y and the temperature rises, this indicates an exothermic reaction, or a reaction that releases heat. The solubility of the solid in the solution may also be temperature-dependent, potentially leading to a supersaturated solution if the temperature is cooled after the solute is added. This supersaturated solution is relatively stable, but adding more solid or initiating other forms of agitation can disturb this equilibrium and trigger further reactions, potentially causing additional temperature changes. Note that this behavior is similar to certain hand warmer mechanisms that take advantage of such exothermic reactions and solubility behaviors to generate heat.

https://brainly.com/question/35381706

#SPJ12

Answer:2:3

Explanation: on edginuity

A hydrogen bomb relies on a nuclear fission bomb to trigger a fusion reaction between deuterium and tritium using lithium deuteride as the fusion fuel. The explosion is enhanced by a U-238 shell which reflects neutrons back into the fuel and fissions to add to the energy output. This process results in a bomb significantly more powerful than atomic bombs.

The construction and subsequent chain of reactions in a hydrogen bomb, or a thermonuclear bomb, typically begin with a nuclear fission bomb. The fission bomb, when exploded, produces extremely high temperatures necessary for fusion to occur. A common method is to use lithium deuteride as the fusion fuel, which is in close proximity to the fission bomb. Upon detonation, the fission bomb's gamma rays heat and compress the fusion fuel. Meanwhile, neutrons from the fission reaction cause the lithium to undergo a reaction to generate tritium: n + 6Li → ³ H + ª He. This newly generated tritium then fuses with deuterium in the reaction 2H+ ³H → He + n + 17.6 MeV, producing helium, another neutron, and a significant amount of energy.

Additional fusion and fission fuels are enclosed within a dense shell of U-238. This uranium shell serves two purposes: it reflects some neutrons back into the fuel to enhance fusion, and the fast-moving neutrons cause the uranium itself to fission, adding to the overall energy output of the bomb.

The first hydrogen bomb was detonated in 1952, but unlike the atomic bomb, a hydrogen bomb has never been used in warfare. Thermonuclear bombs are significantly more powerful than atomic ones - the power of a modern hydrogen bomb is approximately 1000 times that of the bombs dropped on Hiroshima and Nagasaki during World War II.

https://brainly.com/question/32306622

#SPJ12

The reaction given is 2NO(g) + Cl2(g) ⇌ 2NOCl(g). The initial concentrations of NO and Cl2 are 0.50 M. At equilibrium, concentration of NOCl is 0.30 M, while concentrations of NO and Cl2 are 0.20 M. The equilibrium constant Kc for this reaction at this temperature is thus calculated to be 9.0 M⁻².

The value of Kc at a given temperature for a reaction can be calculated using the equilibrium concentrations of the reactants and products in the chemical equation. The reaction described here is 2NO(g) + Cl2(g) ⇌ 2NOCl(g).

At equilibrium, the concentration of NOCl is given as 0.30 M, while we are not provided with the equilibrium concentrations of NO and Cl2, but we know that initially they were both 0.50 M.

The expression for the equilibrium constant Kc in this case would be: Kc = [NOCl]² / ([NO]² [Cl2])

Therefore, calculating equilibrium concentrations of NO and Cl2 from the balanced chemical equation since each 2 moles of NO and Cl2 react to form 2 moles of NOCl, [NO] = [Cl2] = 0.50M - 0.30M = 0.20M.

Substituting these equilibrium concentrations, the value of the Kc becomes:

Kc = (0.30²) / (0.20² * 0.20) = 9.0 M⁻²

https://brainly.com/question/3920294

#SPJ3

Answer:1.b

2.c

3.a

4.d

5.c

6.b

7.d

8.d

9.c

10.a

Explanation:

Answer:

color key

creating a color key

Have known pH values

Explanation:

To determine the pH of a solution using a pH indicator paper, you need a Colour key.

Colour key is need determine the pH of a solution.

To learn more about pH value and colour key refer:https://brainly.com/question/13576450

#SPJ2

Im not sure what it is but i will try      

BaCl₂(aq) + Na₂SO₄(aq) = BaSO₄(s) + 2NaCl(aq)

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq) = BaSO₄(s) + 2Na⁺(aq) + 2Cl⁻(aq)

Ba²⁺(aq) + SO₄²⁻(aq)= BaSO₄(s)

The ionic reaction is

Ba2+ + 2 Br- + 2 Na+  + SO42----->   2 Na+ + 2Br- + BaSO4.

Na+ and Br- are on both sides of the equation so they are spectator ions.

The answer is A Br- (aq).

A. Dehydration reactions.