In a buffer solution made of acetic acid and sodium acetate, if a small amount of acid is added, the added acid will react with whome?

The acid reacts with the conjugate base producing more weak acid.

Explanation:

A buffer solution is defined as the mixture of a weak acid and its conjugate base or a weak base with its conjugate acid.

The acetic buffer, CH₃COOH/CH₃COO⁻, is in equilibrium with water as follows:

CH₃COOH(aq) + H₂O(l) ⇄ CH₃COO⁻(aq) + H₃O⁺

When an acid HX (Source of H₃O⁺) is added to the buffer, the reaction that occurs is:

CH₃COO⁻ + HX → CH₃COOH

In fact, this is the principle of the buffer:

An acid reacts with the conjugate base producing weak acid. And the weak acid reacts with a base producing conjugate base

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