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I was attempting the following question:


A 50ml mixture of 0.0600molL-1 benzoic acid and 0.0800molL-1 hypochlorous acid is at equilibrium.

Ka (benzoic acid) 6.28 x 10-5
Ka (hypochlorous acid) = 3 x 10-8

The mixture is titrated with 0.1 M KOH. Calculate the pH and volume at each equivalence point.

Now I know how to calculate pH at the equivalence point if there is only one weak acid, but I'm not sure how to go about it when there are TWO equivalence points?

Is it correct to say that the stronger acid (benzoic) will be completely neutralised first (1st equivalence point), and AFTER this point the weaker acid (hypochlorous) will start to be neutralised (2nd equivalence point)? Or do both acids become neutralised at the same time?

And also, how would I go about calculating the pH at the equivalence points? As there are two acids contributing to the H3O+ concentration, and the two acids are also reacting with each other (benzoic acid reacts with the dissociated form of hypochlorous acid, to form a benzoate ion and hypochlorous acid).

Any help would be really appreciated!! 

Thanks in advance.

[AWK]

http://www2.iq.usp.br/docente/gutz/Curtipot_.html

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I have tried this program, however it hasnt given very good results.

If you can help in any other way I'd really appreciate it!