Which statement is true of ph buffers? (a) they consist of strong acids and strong bases. (b) they keep the ph of the blood constant. (c) they consist of weak acids and weak bases. both (a) and (b). both (b) and (c).

Both (b) and (c).

Explanation: A buffer solution is a solution that prevents changes in pH. These solutions are composed of a weak acid and its conjugated base, for example CH3COOH (acetic acid) and CH3COO− (acetate ion), or a weak base and its conjugated acid, for example NH 3 (Ammonia) and NH4+ (ammonium ion). Buffer solutions are very important in biological systems since they can mantain the right pH in blood or inside the cell, so they can function correctly.

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