A 50.0 mL sample of 0.200 M diprotic acid H A ( , ) is titrated with 0.200 M NaOH

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A 50.0 mL sample of 0.200 M diprotic acid H2_2A ( Ka1=4.0×10−4K_{a1}=4.0 \times 10^{-4}, Ka2=4.0×10−8K_{a2}=4.0 \times 10^{-8} ) is titrated with 0.200 M NaOH. What is the pH of the solution after exactly one equivalent of base has been added? (a) 7.007.00 (b) 8.208.20 (c) 5.405.40 (d) 3.403.40

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