Le Chatelier's Principle and Solubility

What happens to the solubility of a slightly soluble salt when the pH of the solution is decreased?

• It becomes zero.

• It decreases.

• It increases.

• It remains unchanged.

When H+ ions are added to a solution of lead(II) fluoride, what happens to the fluoride ions?

• They increase in concentration.

• They remain unchanged.

• They precipitate out of solution.

• They react to form HF.

According to Le Chatelier's principle, how does the system respond to a decrease in fluoride ion concentration?

• Remains at equilibrium.

• Forms a new compound.

• Shifts to the left to form more solid.

• Shifts to the right to dissolve more solid.

Which of the following anions is considered a basic anion?

• Chloride

• Fluoride

• Nitrate

• Sulfate

What is the effect of adding H+ ions to a solution containing a compound with hydroxide ions?

• Decreases solubility

• Increases solubility

• Forms a precipitate

• No effect

What remains constant for lead(II) fluoride when the pH is decreased at a constant temperature?

• Molar solubility

• Ksp value

• Concentration of Pb2+ ions

• Concentration of F- ions

How does the solubility of lead(II) chloride change when the pH is decreased?

• It increases.

• It remains unchanged.

• It decreases.

• It becomes zero.

Why does the solubility of lead(II) chloride remain unchanged when pH is decreased?

• Lead ions precipitate out.

• Chloride ions are anions of negligible basicity.

• Chloride ions react with H+ ions.

• The solution becomes saturated.

What is an anion of negligible basicity?

• An anion that reacts strongly with H+ ions.

• An anion that does not react with H+ ions.

• An anion that forms a precipitate.

• An anion that increases solubility.

Which of the following salts is unaffected by changes in pH due to its anion's negligible basicity?

• Calcium carbonate

• Sodium hydroxide

• Lead(II) fluoride

• Lead(II) chloride