Quantitative Metallurgical Analysis Selected Methods for Chemical Analaysis of
Quantitative Metallurgical Analysis Selected Methods for Chemical Analaysis of
Charles Frederick Sidener
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C. Of per- manganate in ferrous sulphate oxydized by the MnO . One c. C. Of the permanganate being equal to . 002 gram of man- METALLURGICAL ANALYSIS 31 ganese, 20 c. C. Is equal to . 04 gram Mn, and 2 grams of the sample having been taken . 04 X ioo 2 per cent, manganese. References : Ford, Jour. Am. Chem. Soc. , Vol. XX, page 504. Ford, Trans. Am. Inst. Min. Engs. , Vol. IX, page 397. Julian's modification of the above methods is as follows : Ob- tain the manganese dioxide precipitate exactly... as given above ; when the manganese is all oxidized to dioxide, cool, and dilute to 400-450 c. C. Now add from a burette an excess of standard hydrogen peroxide, to completely dissolve the precipitate. The reaction is : MnO () +H O +H SO 4 = MnSO 4 +2H 2 O+O 2 . Immediately titrate the excess of hydrogen peroxide with a stand- ard potassium permanganate solution. The reaction is : 2KMnO 4 +5H 2 O, +4H SO 4 = 2HKSO 4 +2MnSO 4 + 8H 9 O-f5O . The hydrogen peroxide solution is prepared by thoroughly mix- ing one pound of hydrogen peroxide with about eight liters of water and ioo c.
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