2. When analyzing a 0.2505 g sample of dolomite, a precipitate of calcium oxalate CaC2O4 was isolated, for the titration of which (after its dissolution in sulfuric acid went) 20.1 ml of a KMnO4 solution, with a titer for iron of 0.0120 g / ml. Determine the mass fraction of CaCO3 in dolomite.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.