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PBODUCTION OF PEB-SALTS AND HYDBOGEN PEBOXIDE 29 tinuously. The current density used is about 1 amp. per 2 dm. SODIUM SELENATE can be produced by electrolytic 1 oxidation of neutral selenite solution. On evaporation of the solution, crystals of selenate can be obtained to- gether with a small amount of selenium. T h e addition of a small quantity of chromate to the bath prevents the 2 cathodic deposition of selenium. F. Foerster had previously shown that neutral sulphites give, by electro- lytic oxidation, both sulphate a n d dithionate. N o dithion- ate analogue was found by Muller when oxidising the selenites, and in attempting to oxidise sodium tellurite a considerable amount of free tellurium was obtained. It may be remarked that descriptions in patent specifi- cations do not necessarily represent the process as carried out in practice, and in some cases are drawn with that intention. They should therefore be accepted with caution. 12 E. Muller, Ber.,1903,36,42S2. Ber.91902, 35, 2815.PDF Image | MANUFACTURE OF CHEMICALS BY ELECTROLYSIS
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