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Briefly outline a procedure you could use to determine the HC2H3O2 concentration in a vinegar sample.

What would the pH be at the equivalence point of the titration? Briefly explain

  • Chemistry -

    You could titrate a sample of vinegar with a known standard of NaOH. You can look up the details of a titration. The pH at the equivalence point is determined by the hydrolysis of the salt, in this case, acetate (C2H3O2^-).
    ......Ac^- + HOH ==> HAc + OH^-
    Kb for Ac^- (Kw/Ka for HAc) = (HAC)(OH^-)/(Ac^-).
    For weak acid/strong base titrations the pH at the equivalence point is approximately 8.7 for a salt concn of 0.05M.

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