Question

# 3) You combine a solution of silver nitrate (AgNO3) and a solution of sodium carbonate (Na2CO3)...

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) + CO32-(aq) <--> Ag2CO3(s)

2 H+(aq) + CO32-(aq) <--> H2CO3

H2CO3 -> H2O(l) + CO2(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) Ksp 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

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

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