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OasisJuice
Oct18-09, 07:04 PM
A 10.00 mL solution of 0.2500 M CH3COONa is titrated with 0.1300 M HCl to the equivalence point.
CH3COO− + H+ → CH3COOH
volume of HCl required=19.23 mL

Calculate the pH of the solution at the equivalence point.

I've tried this a million ways and still keep getting it wrong. Also, my chemistry prof doesn't respond or have office hours so I'm kind of on my own :( Thank you in advance for your help :).

symbolipoint
Oct18-09, 07:41 PM
You need the dissociation constant for acetic acid. It is a weak acid, and therefore the equivalence point pH will be greater than 7.

Borek
Oct19-09, 03:37 AM
acid base titration equivalence point calculation (http://www.titrations.info/acid-base-titration-equivalence-point-calculation)

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www.titrations.info (http://www.titrations.info) - all about titration (http://www.titrations.info) methods

blitz.km
Oct20-09, 10:17 AM
Dissociation constant for CH3COOH
Ka = 1.8 x 10^-5