Buffer System

What is a buffer?

• Is a solution that resists the change in pH when small amount of acid or base is added

• Is a solution that does not resist the change in pH when small amount of acid or base is added

• Is a solution that resists the change in pH when small amount of acid or base is removed

• Is a solution that resists the change in pH when large amount of acid or base is removed

Which of the following is true about the containment of a buffer?

• It contains mixtures of molecules and ions that resist changes in pH

• It contains mixtures of molecules and ions that do not resist changes in pH

• It contains mixtures of elements and atoms that do not resist changes in pH

• It contains mixtures of elements and atoms that resist changes in pH

Which of the following is not true about buffer solutions and their importance to the human body?

• Human blood is a buffer system; contains H2CO3 and HCO3^-, that helps maintain an effective pH in the bloodstream

• Human blood is a buffer system; contains H2CO3 and HCO3⁺, that helps maintain an effective pH in the bloodstream

Tags

NGSS.HS-LS1-3

Which of the following are examples of buffers? (you may select more that one answer)

• hemoglobin buffer

• phosphate buffer

• ammonium buffer

• nitrate buffer

What is the definition of buffer capacity?

• is the amount of acid or base a buffer solution can absorb without a significant change in pH

• is the amount of acid or base a buffer solution can give out without a significant change in pH

• is the amount of acid a buffer solution can absorb without a significant change in pH

• is the amount of base a buffer solution can absorb without a significant change in pH

Which of the following does not accurately describe the composition of buffer?

• Weak acid and its conjugate base or weak base and its conjugate acid

• Weak acid and its conjugate acid or weak base and its conjugate base

What happens when a strong acid is added to an acidic buffer?

• When an acid is added to a buffered solution, the equilibrium shifts to the left

• When an acid is added to a buffered solution, the equilibrium shifts to the right.

What happens when a strong base is added to an acidic buffer?

• When a base is added to a buffered solution, the equilibrium shifts to the right.

• When a base is added to a buffered solution, the equilibrium shifts to the left.

Which of the following is false about buffer capacity?

• The greater the concentration of the buffering molecules and ions in the solution, the greater is the buffering capacity of the solution

• The lower the concentration of the buffering molecules and ions in the solution, the lower is the buffering capacity of the solution

• The greater the concentration of the buffering molecules and ions in the solution, the lower is the buffering capacity of the solution

What are the factors that influence the effectiveness of a buffer?

• The relative amounts of acid and conjugate base (or and conjugate acid) influence the effectiveness of a buffer.

• The relative amounts of acid and conjugate base (not conjugate acid) influence the effectiveness of a buffer.