Understanding Equilibrium and pH

According to Le Chatelier's Principle, what happens to the position of equilibrium when the concentration of a product is decreased?

• The equilibrium shifts to the left.

• The equilibrium shifts to the right.

• The equilibrium remains unchanged.

• The equilibrium shifts randomly.

Which of the following best describes a buffer solution?

• A solution that changes pH significantly when a small amount of acid is added.

• A solution that maintains a constant pH when small amounts of acid or base are added.

• A solution that only resists changes in pH when a base is added.

• A solution that has a pH of exactly 7.

What is the pH of a neutral solution at 25°C?

• 0

• 7

• 14

• 10

Which of the following is a common component of a buffer solution?

• Strong acid and strong base

• Weak acid and its conjugate base

• Strong acid and its conjugate base

• Weak base and strong acid

How does the addition of a catalyst affect the position of equilibrium in a chemical reaction?

• It shifts the equilibrium to the right.

• It shifts the equilibrium to the left.

• It does not affect the position of equilibrium.

• It increases the concentration of products.

Which of the following best describes the pH scale?

• A scale that measures the concentration of hydroxide ions in a solution.

• A scale that measures the concentration of hydrogen ions in a solution.

• A scale that measures the concentration of water in a solution.

• A scale that measures the concentration of salts in a solution.

What is the effect of adding a small amount of a strong acid to a buffer solution?

• The pH of the buffer solution increases significantly.

• The pH of the buffer solution decreases significantly.

• The pH of the buffer solution remains relatively constant.

• The buffer solution becomes neutral.

What is the definition of dynamic equilibrium?

• Dynamic equilibrium is a state where opposing processes occur at equal rates, leading to no net change.
• Dynamic equilibrium is a state of constant change without any opposing processes.

A weak acid fully dissociates into ions in solution

• True

• False

Blood is a biological buffer

• True

• False