Consider the acetic acid buffer system with acetic acid, CH3COOH, and its salt s

Question

Consider the acetic acid buffer system with acetic acid, CH3COOH, and its salt sodium acetate, NaCH3COO:

CH3COOH(aq)+H2O(l)?H3O+(aq)+CH3COO?(aq)

1. What is the purpose of a buffer system? Please explain.

2. What is the purpose of NaCH3COO in the buffer?

3. How does the buffer react when acid (H3O+) is added?

4. How does the buffer react when base (OH?) is added?

The conjugate acid CH3COO? from the salt NaCH3COO is needed to neutralize any added base. The conjugate base CH3COO? from the salt NaCH3COO is needed to neutralize any added acid.

Explanation / Answer

1) To maintain constant pH in many system buffer solutions are needed.

Ex: blood pH always constant 7.45 . here blood pH manitained by H2CO3 + HCO3- buffer

2) The conjugate base CH3COO- from the salt NaCH3COO is needed to neutralize any added acid.

3) Added H3O+ reacts with CH3COO-

4) Added OH- reacts with CH3COOH

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