Question

Ok last question for now. Calcium is determined in limestone by precip. CaC2O4, dissolving precip. in H2SO4, and titrating with KMnO4. The precipitate from the limestone sample weighs .4463g requires 32.17mL of .1336 N KMnO4 for titration. Find percentage of CaO in the sample.

this is similar to another one I did but with H2O2 but I dont how how many electrons are gained/lost for CaC2O4 to CaO.

Answer 1

1 mol CaO gives 1 mol CaC2O4 so by titrating CaC2O4 that give you C2O4^2- and that givs you CaO. The electron change is witgh the oxalate and not the calcium.