posted by Austin on .
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
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.