Suppose you have created a buffer solution that is 0.250 M in both benzoic acid (HC7H5O2) and potassium benzoate (KC7H5O2) and t
hat the pH of this solution is 4.65. Assuming that the buffer capacity has not been exceeded, which of the pH values listed below would you expect after adding a small amount of a dilute strong acid solution? 8.85
4.49
4.81
2.88
There is not enough information to determine.
We have a buffer form by a weak acid (HC₇H₅O₂) and its conjugate base (C₇H₅O₂⁻). The function of a buffer is to resist abrupt changes of pH when acids or bases are added. If a small amount of a dilute strong acid solution is added, pH will slightly decrease because the acid will be partially neutralized by the basic component of the buffer.
C₇H₅O₂⁻(aq) + H⁺(aq) ⇄ HC₇H₅O₂(aq)
If the pH of the buffer was originally 4.65, a slightly inferior value like 4.49 is plausible.
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