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30 50-60 3 50 0. 2602 25. 36 1. 20-1. 35 50-60 3 30 0. 2531 25. 29 1. 20-1. 29 50-60 4 0. 2522 25. 28 These elements may also be separated in a solution con- taining free nitric acid (p. 179). For effecting the separation in a solution containing phosphates we are indebted to Fernberger and Smith 244 QUANTITATIVE ANALYSIS BY ELECTROLYSIS. for the following particulars: To a solution containing 0. 1329g Cu and 0. 1 g Co in the form of sulphates, 60 cc diso- dium hydrogen phosphate (sp. Gr. 1. 03...58) and 10 cc phosphoric acid (sp. Gr. 1. 347) were added, and the mixture was diluted to a volume of 225 cc. The electrolysis was conducted at 62 with a current of ND 100 = 0. 035 ampere arid a potential- difference of 1. 5 volt. The copper was completely de- posited in 6 hours. Cobalt Bismuth. LITERATURE I Smith and Wallace, Journ. Of Anal. Chem. , 7, 183 (1893). Smith and Moyer, Zeit. F. Anorg. Chem. , 4, 268 (1893). Kammerer, Journ. Am. Chem. Ges. , 25, 83 (1903). According to Smith and Wallace, and also Smith and Moyer, a separation of these metals may be satisfactorily conducted in a solution containing nitric acid.
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