Abstract
Methyl, ethyl,iso-propyl, allyl,n-butyl,t-butyl,iso-amyl, cyclohexyl and benzyl xanthates of potassium have been determined by titrating with iodine and bromine cyanides in aqueous medium at pH 5.0–5.4 and in acetonitrile, ethanol, 1 ∶ 1 ethanol-carbon tetrachloride mixture and ethyl acetate media visually and/or potentiometrically. The xanthates react in the molar ratio 2 ∶ 1 with these oxidants and are oxidised to dixanthogen. The potentiometric titrations of BrCN with xanthates, unlike with other reductants, are possible in aqueous medium even in absence of iodide which has to be added in visual titrations because of a lack of some specific indicator. The titrations are rapid, simple, accurate and reversible and as little as 1 mg can be determined in aqueous or acetonitrile medium.
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