How do you do the problem- the pka for lactic acid, Ask an Expert

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How do you do the problem- The pKa for lactic acid, CH3CH(OH)COOH, is 3.86. At physiological pH (7.40), which is the predominant form, lactic acid or lactate? The answer is "The ratio of lactate to lactic acid is about 3500 to 1" but unsure what to do.

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