A lactic acid/lactate ion buffer solution contains 0.25 MM HC3H5O3HC3H5O3 and 0.78 MM C3H5O3−C3H5O3−, respectively. The KaKaK_{\rm a} value of lactic acid is 1.4×10−41.4×10−4. Calculate the pHpH of this buffer. Express the pH numerically.

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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.141QP: Ka for formic acid is 1.7 104 at 25C. A buffer is made by mixing 529 mL of 0.465 M formic acid,...
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A lactic acid/lactate ion buffer solution contains 0.25 MM HC3H5O3HC3H5O3 and 0.78 MM C3H5O3−C3H5O3−, respectively. The KaKaK_{\rm a} value of lactic acid is 1.4×10−41.4×10−4. Calculate the pHpH of this buffer.
Express the pH numerically.
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