SOLUBILITY O F SILVER OXIDE (in mixtures of water and alcohol a t 25' C.) BY SIMON KLOSKY AND LEO WOO'
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Introduction The solubility of silver oxide in water has been determined by several workers using different methodsJ2but no data seem to be available on the solubility of silver oxide in mixtures of water and alcohol. Experimental Silver oxide was prepared by treating a concentrated solution of analyzed silver nitrate with an excess of sodium hydroxide solution, made by dissolving sticks of C. P. sodium hydroxide. The precipitate was allowed to settle and washed by decantation until the wash water gave no sodium flame test. The silver oxide was then dried in a desiccator over concentrated sulphuric acid. The ethyl alcohol was prepared by carefully redistilling twice with a long column still a constant boiling fraction of 95% C. P. ethyl alcohol. No attempt was made to dry the alcohol- its composition having been determined by measuring the density with a pyknometer. The dried silver oxide was placed in mixtures of water and alcohol contained in bottles which were equipped with mercury seals to prevent evaporation of alcohol. The bottles were put in a thermostat a t 25' C. and stirring was continued for about ten hours. The solutions were filtered after being allowed to settle for about ao hour. A small amount of O.IN KC1 was added to the filtrate and the turbidity was compared with that of a standard solution prepared by precipitating silver nitrate of known concentration under identical conditions including the same percentage of alcohol. Two determinations were made in each case. The mean values are given below:
70of
alcohol by weight. 0
10.95
Solubility of silver oxide, mgms. per liter 26.2
22.92
19.7 18.1
34.30
17.6
45.70
17.4
64.00 77.00
14.5
91-50
9.1
12.0
Contribution from the Martin Maloney Chemical Laboratory of The Catholic Cniversity of America. Extract from Master's Thesis, 1926. Noyes and Kohr: J. Am. Chem. SOC., 24 1144 (~goz).-Gravimetric. Abegg and Cox: Z. ph sik. Chem., 46 I (1903).-E. M. F. Rebihre: Bull. (4) 17, 309 (~g~g).-Gravimetric. Whitty: Z. anor . Chem., 67 62 (IgIo).-Colorimetric. Bottger: Z. physik. Chem., 46, 521 (IgoA)-confuctivity.
