Calculate the pH of 0.250 L of a 0.65 M formic acid (HCO2H) - 0.10 M sodium formate (HCO2Na) buffer before (on your own) and after the addition of (a) 0.010 mol of NaOH (on your own) and (b) 0.010 mol of HCl (in the blank). Assume that the volume remains constant.

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