Abstract
Mercury(I) can be titrated potentiometrically with permanganate in the presence of fluoride and sulphuric acid The optimum conditions are 2.5– 10 ml of 9 N acid and 10–100 ml of 2% sodium fluoride at a tempeiature of 25–40° Larger amounts can be determined than in the visual method, although copper (II) is a suitable indicator screen in the titration of fairly large amounts The reverse titration is also satisfactory, the optimum conditions are 1.5–4 ml of 9 N acid and 25–75 ml of 2% fluoride at 25–40°. The formal redox potential of the Mn +7/Mn +3 couple is 14 V, in piesence of 1.38 N H 2S0 4 and 0 12 N NaF
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