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Question(s) / Instruction(s):

A buffer solution of volume 100.0 mL is 0.150 M Na2HPO4(aq) and 0.100 M KH2PO4(aq). Refer to table 1 for Ka values.

Pka1 : 2.12 Pka2: 7.21 Pka3: 12.68

(a) What is the pH of the solution after the addition of 80.0 mL of 0.0500 M NaOH(aq) to the buffer?

(b) What is the pH of the solution after the addition of 10.0 mL of 1.0 M HNO3(aq) to the initial buffer?

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