What is the molarity of the KMnO4 solution when a 21.40 ml volume of a KMnO4 solution was required to titrate 25.00 ml of a 0.0400 M oxalic acid solution?
A 0.520 g sample of an unknown iron compound needed 30.6 ml of 0.0200M KMnO4 solution for complete reaction. Assuming the unknown has one iron per formula unit; calculate the molecular weight of the unknown.