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Weak Acid pH Curve

This overview explains the pH curve of weak acids as described by the Henderson-Hasselbalch equation. Initially, when the concentration of the salt is low and the concentration of the acid is high, the pH changes dramatically as the reaction progresses. As the concentrations of the salt and acid approach parity, the logarithmic ratio of salt to acid changes only slightly, leading to minimal changes in pH. This behavior illustrates the buffering capacity of weak acids in chemical reactions.

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Weak Acid pH Curve

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  1. Weak Acid pH Curve Henderson Hasslebach Equation: • At first [salt] is very low, [acid] is high. • As reaction proceeds, initially log [salt]/[acid] changes dramatically and hence so does pH • But as [salt] and [acid] approach parity log [salt]/[acid] changes only slightly and hence so does pH.

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