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Topic: Finding the equilibrium concentration of the conugate base  (Read 3916 times)

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Offline csinha

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Finding the equilibrium concentration of the conugate base
« on: November 11, 2011, 08:47:05 PM »
The question is: At 25 degrees celsius, the pH of an aqueous solution of benzoic acid, pKa = 4.202 is measured (at equilibrium) to be 3.61.

What is the equilibrium concentration of the conjugate base?

This is a multipart question but I listed the one I am having trouble with. Previous question asked to find concentration of H3O+; since pH is given it is just 10^-3.61 but would the concentration of the conjugate base not be equal to the concentration of H3O+?

Offline Borek

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Re: Finding the equilibrium concentration of the conugate base
« Reply #1 on: November 12, 2011, 05:26:56 AM »
would the concentration of the conjugate base not be equal to the concentration of H3O+?

It would in this case. Note that it doesn't have to be true for diluted solutions, when concentration of H+ from water autodissociation starts to play an important role.
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