A Systematic Handbook of Volumetric Analysis Or the Quantitative Determination
A Systematic Handbook of Volumetric Analysis Or the Quantitative Determination
Francis Sutton
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63, 364. 290 NITRITES. potash during evaporation prevented the loss of any HNO 2 ; and on the other hand the addition of a slight excess of ammonium chloride entirely destroyed it. Therefore by a combination of the mercury and the urea methods, the determination of nitric and nitrous acids may be satisfactorily accomplished, the destruction of the HN0 2 on the one hand being effected by excess of NH 4 C1, whilst on the other hand all loss of HNO 2 may be avoided by evaporation with caustic alka...li. The mode of procedure has the advantage over all differential methods in that each acid is determined individually and independently of the other. 4. Mixtures of Nitrites with Alkali Sulphites and Thiosulphates. Lunge and Smith* have shown that the only satisfactory method of completely oxidizing sulphites and thiosulphates by permanganate is to add to the solution a large excess of permanganate, more than sufficient for complete oxidation, and accompanied with formation of Mn0 2 . Excess of FeSO 4 is then added, and again permanganate till pink.
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