Abstract
The factors affecting the success of both visual and potentiometric end-point detection in titration of bisulphite with permanganate in the presence of fluoride are examined. The optimum conditions are 0·02 M H 2SO 4 and 0·24–0·38 M NaF. The oxidation product comprises dithionate and sulphate according to the overall reaction MnO 4 − + H + + 2HF 2 − + 3HSO 3 − ⇌ MnF 4 − + S 2O 6 2− + SO 4 2− + 3H 2O. The reverse titration is also satisfactory, but proceeds quantitatively according to MnO 4 2− + 2HF 2 − + 2HSO 3 − ⇌ MnF 4 − + 2SO 4 2− + 2H 2O.
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