Electrolytic Separations Possible With a Rotating Anode...
Electrolytic Separations Possible With a Rotating Anode...
Donald Sinclair Ashbrook
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5. From Chromium. (a) In sulphuric acid solution. — ^The same conditions were used as in the separation of copper from aluminium. Copper present 0.2890 gram, chromium 0.2500 gram. Copper fotind 0.2890 gram-0.2891 gram-0.2890 gram. Digitized by Googk Better deposits were obtained by starting the current at 3 amperes and raising gradually to 5 amperes. (b) In nitric acid solution, — ^The same conditions were used as in the separation of copper from altiminium. Copper present 0.2874 gram, chromium... 0.2500 gram. Copper fotmd 0.2874 gram-o.287S gram-0.2874 gram. If the current was allowed to run above 3 amperes the deposit weighed too high. A blank was run with chro- mium alone under the same conditions, which gave 0.0022 gram of a metal showing all the tests for chromium. (c) In phosphoric acid solution. — The same conditions were used as in the separation of copper from aluminium. Copper present 0.2742 gram, chromium 0.2500 gram. Copper found 0.2742 gram~o.2 74o gram-0.2742 gram. Slight traces of phosphorus were foimd in the deposits.
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