Answer to Question #151905 in General Chemistry for Mari

Question

What species make a buffer solution
1: CH3COO + H3O
2: HCH3COO and H3O
3: HCH3COO and CH3COO
4: HCH3COO and OH
5: CH3COO and OH

Answer 1

A buffer solution is a solution of a weak acid and it's salt with a strong base.

Buffer solution can be made by mixing weak acid and it's salt

1: CH3COO + H3O

Acetic acid (CH3COOH) and a acidic solution

2: HCH3COO and H3O

Acetic acid (HCH3COO) and acidic solution

3: HCH3COO and CH3COO

Acetic acid (CH3COOH) and it's salt, acetate salt (CH3COO–)

4: HCH3COO and OH

Acetic acid (CH3COOH) and base (OH–)

5: CH3COO and OH

acetate salt (CH3COO–) and base (OH–)

Only 3: HCH3COO and CH3COO represent acetic acid (CH3COOH) and it's salt, acetate salt (CH3COO–).

So, 3: HCH3COO and CH3COO can be used to prepare buffer solution.