Question

Which combination will make a buffer?

A. NaOH and NaCl

B. KOH and KC1

C. HC1 and NaCl

D. CH3COOH and CH3COONa

Answer 1

Answer:

D

Explanation:

A buffer solution contains (1)a weak base and its salt, or (2) a weak acid and its salt.

So, the combination of the weak acid CH3COOH and its salt CH3COONa will make a buffer.

Answer 2

Answer:

D. CH3COOH and CH3COONa

Explanation:

A buffer is made of:

- a weak acid + its conjugate base

- a weak base + its conjugate acid

A. NaOH is a strong base

B. KOH is a strong base

C. HCl is a strong acid