Calculate the concentrations of total acetate ion for the 7 solutions below, pre

Question

Calculate the concentrations of total acetate ion for the 7 solutions below, prepared by mixing the specified volumes of .75 M acetic acid with .75 M sodium acetate, then diluting to 100.00 ml with water. Buffer # 1 2 3 4 5 6 7 .75 M acetic acid (ml) 9.5 9.0 7.5 5.0 2.5 1.0 .5 .75 M sodium acetate (ml) .5 1.0 2.5 5.0 7.5 9.0 9.5 I'm confused on this because if acetic acid and sodium acetate are in a solution, there is a common ion of C2H3O2^- and I'm not sure how I would calculate it. Please help me.

Explanation / Answer

Use the henderson hasselbalch equation. Don't bother with the common ion. Assume that the initial concentrations are the concentrations of HA and A- that you plug into the Henderson-Hasselbalch.

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