Question
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
What would the pH be at the equivalence point of the titration? Briefly explain
Answers
DrBob222
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.
......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.