What is the ph of a solution that is 0.50 m in propanoic acid and 0.40 m in sodium propanoate. (ka for propanoic acid = 1.3 x 10-5)?

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26-04-2018
Chemistry

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What is the ph of a solution that is 0.50 m in propanoic acid and 0.40 m in sodium propanoate. (ka for propanoic acid = 1.3 x 10-5)?

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tаskmasters tаskmasters · Answer 1 · 2018-05-05T08:38:08+02:00

tаskmasters tаskmasters

05-05-2018

The pH is given by the Henderson - Hasselbalch equation:
              pH = pKa + log([A-]/[HA])
              pH = -log(1.3 x 10^-5) + log(0.50/0.40)
              pH = 4.98
The answer to this question is 4.98.

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