pH and Solubility

Adding an acid to a solution does which of the following?

• Adds hydroxide to the solution

• Adds hydrogen ions to the solution.

• increases the pH

Adding a base to a solution does which of the following?

• decreases the pH

• adds hydrogen ions to the solution

• adds hydroxide to the solution

Which of the following equation represents the equilibrium equation of solubility of BaSO₄ in water ?

• BaSO₄(s) ↔ Ba²⁺(aq) + 2SO₄^-(aq)

• BaSO₄(s) ↔ Ba⁺(aq) + 4SO^-(aq)

• BaSO₄(s) ↔ Ba⁺(aq) + SO₄^-(aq)

• BaSO₄(s) ↔ Ba²⁺(aq) + SO₄^2-(aq)

Which of the following equation represents the equilibrium equation of solubility of Cr(OH)₃ in water ?

• Cr(OH)₃(s) ↔ Cr³⁺(aq) + OH^3-(aq)

• Cr(OH)₃(s) ↔ Cr⁺(aq) + OH^3-(aq)

• Cr(OH)₃(s) ↔ Cr³⁺(aq) + 3OH^-(aq)

• Cr(OH)₃(s) ↔ 3Cr⁺(aq) + OH^3-(aq)

Which of the following are ALL strong acids?

• HCN, HBr,HF

• HNO₃, HNO₂, HSO₄^-1

• HCl, HBr, HNO₃

• HCl, HCOOH, HI

The addition of nitric acid (HNO₃) increases the solubility of which of the following solids?

• KCl

• Pb(CN)₂

• Cu(NO₃)₂

• NH₄NO₃

Sr(OH)_2(s) ↔ Sr⁺²_(aq) + 2OH^-1_(aq)

When HCl is added: H⁺_(aq) + OH^-1_(aq) → H₂O_(l)

What effect does the addition of the acid have on the solubility of strontium hydroxide?

• the solubility increases because some of the OH^-1 is removed and the equilibrium shifts to the left.

• the solubility increases because some of the OH^-1 is removed and the equilibrium shifts to the right

• the solubility decreases because the hydroxide is removed

• the acid does not affect the solubility of the magnesium hydroxide

BaF_2(s) ↔ Ba⁺²_(aq) + 2F^-1_(aq)

HF ↔ H⁺¹_(aq) + F^-1_(aq)

What would increase the solubility of barium fluoride?

• adding an acid because the hydrogen will react with the fluoride to form HF and the solubility equilibrium will shift to the right.

• adding barium nitrate because adding more barium will cause a shift to the left

• adding potassium fluoride because adding more fluoride will cause a shift to the left

Zinc hydroxide is a sparingly soluble base. If you add sodium hydroxide to a solution of zinc hydroxide, what will happen?

• The addition will have limited impact.

• The solubility of zinc hydroxide will increase.

• The solubility of zinc hydroxide will decrease.

• We would need to know the molar concentrations of each substance in order to answer this question.

Ag(OH)_{2(s )} ↔ Ag⁺¹_(aq) + 2OH^-1_(aq)

What shift in equilibrium causes a decrease in the solubility of silver hydroxide?

• a shift to the right because there are more ions

• a shift to the left because more of the solid means less has dissolved thus decreasing the solubility.