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The half‑equivalence point of a titration occurs half way to the equivalence point, where half of...

The half‑equivalence point of a titration occurs half way to the equivalence point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.

If 0.5800.580 moles of a monoprotic weak acid (?a=3.6×10−5)(Ka=3.6×10−5) is titrated with NaOH,NaOH, what is the pH of the solution at the half‑equivalence point?

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Answer #1

At half equivalence point, pH = pKa

use:

pKa = -log Ka

= -log (3.6*10^-5)

= 4.4437

So, pH = 4.4437

Answer: 4.44

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