AP Chemistry Buffers

Substances that help organisms minimize changes in pH are

• bases

• acids

• buffers

If the pH of milk changes very little when acid or base is added, the milk probably contains

• more acid

• more base

• buffers

Buffers help keep pH constant by adding or absorbing

• H+

• Na+

• Cl-

• electrons

Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.

• lower

• higher

• the same

• none of the above

If a pH is too basic, what can be added to make the pH more acidic?

• Sulfuric Acid

• Sodium Hydroxide

• Water

• Calcium Carbonate

The pH scale is a range from:

• 1-7

• 0-14

• 1-5

• 1-20

What is the primary function of a buffer in a chemical solution?

• To increase the pH

• To decrease the pH

• To maintain a stable pH

• To neutralize the solution

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

• Strong acid

• Weak acid and its conjugate base

• Strong base

• Salt and water

In the buffer system of acetic acid and sodium acetate, which component acts as the weak acid?

• Acetic acid

• Sodium acetate

• Water

• Hydrogen ion

What happens to the pH of a buffer solution when a small amount of acid is added?

• The pH increases significantly

• The pH decreases significantly

• The pH remains relatively constant

• The pH becomes neutral