12.)Part C After the addition of 0.0050 mol of HCl. Assume that the volume remai

Question

12.)Part C

After the addition of 0.0050 mol of HCl. Assume that the volume remains constant.

Express your answer using three significant figures.

13.)Part A

Which solution would come closest to making a pH 7 buffer? (Reference data for phosphoric acid, H3PO4: pKa1 = 2.2, pKa2 = 7.2, pKa3 = 12.2)

A.) a solution containing equal amounts of Na2HPO4 and Na3PO4 B.) a solution containing equal amounts of H3PO4 and NaH2PO4 C.) a solution containing equal amounts of NaH2PO4 and Na2HPO4 D.) a solution of Na2HPO4

Explanation / Answer

13) we know that the pH of buffer is given as

pH = pKa + log [salt] / [Acid]

So the pH will come closer to 7 when pKa will be near to 7

So pKa2 = 7.2

so the solution should have

NaH2PO4 + Na2HPO4 and their equal amount

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