What is the initial pH of a 0.0025 M solution made pyrophosphoric acid. (This is an...

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What is the initial pH of a 0.0025 M solution made pyrophosphoric acid. (This is an analytical chemistry question)

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Answer 1

Answer #1

Ka of pyrophosphoric acid = 1.2 × 10⁻¹

concentration = 0.0025 M

H4P2O7 ------------> H+ + H3P2O7-

0.0025 0 0

0.0025 - x x x

Ka = x^2 / 0.0025 - x

0.12 = x^2 / 0.0025 - x

x = 2.45 x 10^-3

pH = -log (2.45 x 10^-3)

pH = 2.61

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Answer 2

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