Abstract
A neutral or weakly acid solution of Cr(III) is treated with acetate buffer and freshly filtered KMnO 4 solution. Equivalent amounts of soluble chromate and insoluble MnO 2 are formed in a short time. The MnO 2 is quantitatively collected on a fritted glass filter and washed. After dissolution with ascorbic acid the Mn 2+ ions are titrated with EDTA. Large relative amounts of Zn, Cd, or Cu do not interfere since remaining traces in the titrate may be easily masked.
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