Chemistry

Problem

A buffer solution is prepared by dissolving a monoprotic acid HA and its sodium salt NaA to make 250.0 mL of solution in which

[HA] = 0.250\,\text{M}

and

[A^-] = 0.250\,\text{M}

(

pK_a = 7.20

). What maximum volume of 0.100 M NaOH can be added before the pH of the buffer reaches 7.40? Assume volumes are additive and report the volume in milliliters to three significant figures.

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