Potassium chromous sulphate

X 10 ii per cent. C. F. Schonbein, N. Bunge, Z. Roussin, and C. W. Vincent prepared a mercury-chromium alloy or chromium amalgam, by the action of potassium or sodium amalgam on a cone. soln. of chromic chloride and H. Moissan obtained the amalgam by a similar process, as well as by the action of sodium amalgam on chromous chloride, bromide, or iodide. R. Myers obtained it by the electrolysis of a soln. of chromic sulphate in dil. sulphuric acid using a platinum anode, and mercury cathode J. Feree found that with a soln. of chromic chloride the yield is poor. 

Schumann i made some observations on the relative affinities of chromium and the metals for sulphur and oxygen. According to A. Moberg, when chromous chloride is treated with ammonium sulphide, a black precipitate—presumably chromous sulphide or chromium monosulphide, CrS—is formed E. M. P ligot obtained it by the use of potassium sulphide and observed that the precipitate is insoluble in an excess of the precipitant. M. Traube observed that the sulphide occurs among the products of the reduction of chromic sulphate heated in hydrogen. 

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