Abstract
Methods of standardisation of vanadium(II) sulphate against iron(III) solutions are described. The standardisation can be carried out visually at a temperature of about 80° using acetylacetone, or meconic, salicylic or sulphosalicylic acids as internal indicators. The titration can be carried out at room temperature if copper(II) is used as a catalyst; the end-point can be detected with methylene blue, gallocyanine or potentiometrically as well as by the indicators listed above. The copper(II) catalyses the oxidation of vanadium(III) to vanadium(IV), which is slow at room temperature.
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