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Using the Henderson-Hasselbalch equation, calculate the pH of a buffer solution containing 0.2 M formic acid (pKa = 3.75) and 0.1 M sodium formate.

Using the Henderson-Hasselbalch equation, calculate the pH of a buffer solution containing 0.2 M formic acid (pK_a = 3.75) and 0.1 M sodium formate.