Answer to Question #93863 in General Chemistry for Kylie

Question

Why do you have to warm oxalate ions before performing a titration? How is the end point of this titration determined?

Answer 1

Oxalic acid is heated before titration with KMnO4 solution because this reaction happens only in certain temperature. 

Redox Titrations Reduction of purple permanganate ion to the colorless Mn+2 ion, the solution will turn from dark purple to a faint pink color at the equivalence point. No additional indicator is needed for this titration.