# Worksheet: The Henderson–Hasselbalch Equation

In this worksheet, we will practice using the Henderson–Hasselbalch equation, calculating pH from the pKa and concentrations of conjugate acid–base pairs.

**Q1: **

Consider the equilibrium

What is in a solution of and at ?

- A M
- B M
- C M
- D M
- E M

**Q2: **

Consider the equilibrium

What is in a solution of and ?

- A
- B
- C
- D
- E

**Q3: **

What concentration of is required to make = in a 0.200 M solution of ? of is .

- A 0.14 M
- B 0.52 M
- C 1.6 M
- D 0.36 M
- E 0.58 M

**Q4: **

Consider the equilibrium

What is in a solution of and ?

- A M
- B M
- C M
- D M
- E M

**Q5: **

What concentration of is required to make in a 0.320 M solution of ? of hydrofluoric acid is .

**Q6: **

A 1.00 L aqueous buffer solution is prepared from and . The of is and the self-ionization constant of water, , is . Calculate to 1 decimal place the pH of the buffer solution.

**Q7: **

To 2 significant figures, what mass of must be added to 0.650 L of a 0.120 M solution of to give a buffer solution with a pH of 9.08? Assume a negligible change in volume as the solid is added. The of is .