Solubility and Equilibrium Principles

This video tutorial covers the topic of pH and solubility, focusing on how changes in pH affect the solubility of salts. It explains the application of Le Chatelier's principle using lead sulfide as an example. The video demonstrates how adding acid to a solution shifts the equilibrium, leading to increased solubility of the salt. The process involves the reaction of sulfide ions with water to form hydrogen sulfide and hydroxide ions. The tutorial concludes by emphasizing the importance of understanding these chemical principles to predict solubility changes.

What is the main focus of the topic discussed in the video?

• The impact of light on solubility

• The role of pressure in solubility

• The qualitative effect of pH changes on solubility

• The effect of temperature on solubility

How does the formation of a weak acid from an anion affect the solubility of a salt?

• It has no effect on solubility

• It increases the solubility in basic solutions

• It decreases the solubility in acidic solutions

• It increases the solubility in acidic solutions

What is the role of Le Chatelier's principle in the context of solubility?

• It describes how equilibrium shifts in response to changes

• It explains the temperature dependence of solubility

• It determines the speed of dissolution

• It predicts the color change of a solution

What happens to lead(II) sulfide in water?

• It forms a precipitate

• It dissociates into lead ions and sulfide ions

• It reacts to form a gas

• It remains unchanged

What is formed when sulfide ions react with water?

• Sulfuric acid and hydroxide

• Hydrogen sulfide and hydroxide

• Sulfur trioxide and hydrogen

• Sulfur dioxide and water

How does adding acid affect the equilibrium of lead(II) sulfide in water?

• It causes the equilibrium to disappear

• It shifts the equilibrium to the reactant side

• It has no effect on the equilibrium

• It shifts the equilibrium to the product side

Why does the addition of acid lead to more dissolution of lead(II) sulfide?

• Because it removes hydroxide ions, shifting equilibrium

• Because it decreases the pressure

• Because it increases the temperature

• Because it adds more sulfide ions

What is the result of the equilibrium shift when acid is added to the solution?

• More lead(II) sulfide precipitates

• More lead(II) sulfide dissolves

• The solution becomes basic

• The solution becomes neutral

What principle helps us understand the effect of pH on solubility?

• Avogadro's Law

• Newton's Third Law

• Le Chatelier's Principle

• Boyle's Law

How does pH influence the solubility of salts?

• It decreases solubility by forming precipitates

• It can increase solubility by shifting equilibrium

• It only affects solubility at high temperatures

• It has no influence