Question

3) You combine a solution of silver nitrate (AgNO₃) and a solution of sodium carbonate (Na₂CO₃) to form solid silver carbonate (Ag₂CO₃) and aqueous sodium nitrate (NaNO₃), the net ionic equation is listed below. You observe the white solid, Ag₂CO₃ in the test tube. You add a strong acid (HNO₃) to the mixture and it reacts with the carbonate ions as listed in the equations below. What would you expect to observe when adding the strong acid to the test tube?

2 Ag⁺_(aq) + CO₃^2-_(aq) <--> Ag₂CO_3(s)

2 H⁺_(aq) + CO₃^2-(aq) <--> H₂CO₃

H₂CO₃ -> H₂O_(l) + CO_2(g)

A) An increase in the amount of white solid

B) A color change of the solid

C) A decrease in the amount of white solid

D) No change in the amount of white solid

4) K_sp of BaF₂ at room temperature is 1.84 x 10^-7. It is also known that the reaction of dissolution of BaF₂ is endothermic. Imagine that you have a saturated solution of BaF₂ at equilibrium, that has some undissolved BaF₂ precipitated on the bottom of the test tube.

4.1) If the temperature is increased how would that affect:

i) The solubility of BaF₂

A) Increase

B) Decrease

C) Remain Unchanged

ii) The solubility constant of BaF₂

A) Increase

B) Decrease

C) Remain unchanged

4.2 An additional amount of BaF₂ was added to the solution how would that affect:

i) The solubility of BaF₂

A) Increase

B) Decrease

C) Remain unchanged

ii) The solubility constant of BaF₂

A) Increase

B) Decrease

C) Remain unchanged

4.3 If NaF is added to the solution how will it affect:

i) The solubility of BaF₂

A) Increase

B) Decrease

C) Remain Unchanged

ii) The solubility constant of BaF₂

A) Increase

B) Decrease

C) Remain unchanged

Answer 1

3)

answer : C) A decrease in the amount of white solid

4.1) If the temperature is increased how would that affect:

i) The solubility of BaF₂

A) Increase

ii) The solubility constant of BaF₂

A) Increase

4.2 An additional amount of BaF₂ was added to the solution how would that affect:

i) The solubility of BaF₂

B) Decrease

ii) The solubility constant of BaF₂

C) Remain unchanged

4.3 If NaF is added to the solution how will it affect:

i) The solubility of BaF₂

B) Decrease

ii) The solubility constant of BaF₂

C) Remain unchanged