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A 130.0-mL aliquot of 0.129 M diprotic acid H2A (pK1 = 4.04, pK2 = 8.08) was...

A 130.0-mL aliquot of 0.129 M diprotic acid H2A (pK1 = 4.04, pK2 = 8.08) was titrated with 1.29 M NaOH. Find the pH at the following volumes of base added: Vb = 0.00, 1.40, 6.50, 12.00, 13.00, 14.00, 19.50, 25.00, 26.00, and 30.00 mL. (Assume Kw = 1.01 ✕ 10−14.)

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