Researches upon the atomic weights of cadmium, manganese, bromine, lead, arsenic, iodine, silver, chromium, and phosphorus . at usually employed in thislaboratory for the analysis of metalHc haUdes. Weighed portions of thebromide, after fusion in nitrogen and hydrobromic-acid gases, were first titratedagainst weighed portions of silver. Then the precipitated silver bromide wascollected and weighed. ^ Richards: Pub. Car. Inst. No. 28, p. 19 (1905); Jour. Amer. Chem. Soc, 27, 475; Zeit-anorg. Chem., 47, 72, 2 Baxter: Proc. Amer. 41, 79 (1905); Jour. Amer. Chem. Soc.,27, 881; Zeit.
Researches upon the atomic weights of cadmium, manganese, bromine, lead, arsenic, iodine, silver, chromium, and phosphorus . at usually employed in thislaboratory for the analysis of metalHc haUdes. Weighed portions of thebromide, after fusion in nitrogen and hydrobromic-acid gases, were first titratedagainst weighed portions of silver. Then the precipitated silver bromide wascollected and weighed. ^ Richards: Pub. Car. Inst. No. 28, p. 19 (1905); Jour. Amer. Chem. Soc, 27, 475; Zeit-anorg. Chem., 47, 72, 2 Baxter: Proc. Amer. 41, 79 (1905); Jour. Amer. Chem. Soc.,27, 881; Zeit. , 46, 42. (See page 108.) THE ANALYSIS OF CADMIUM BROMIDE. 23 The apparatus used for the fusion of the salt in nitrogen and hydrobromic-acid gases was employed in the preparation of ferrous bromide by one of us/and is a modification of apparatus used for a similar purpose in the determina-tion of the atomic weight of cobalt,^ in this laboratory. Nitrogen was preparedby passing air through concentrated ammonia solution in the bottle F (fig. 3)and then over hot copper gauze in the hard-glass tube G. The excess of am-. FiG. 3. — Apparatus for the fusion of bromides in a current of dry nitrogenand hydrobromic-acid gases. monia was removed by dilute sulphuric acid in the bottles H and I. The gaswas then conducted into an apparatus constructed wholly of glass, with groundjoints, which consisted of a tower, J, filled with beads moistened with silver ni-trate solution to remove sulphur compounds, two similar towers, K and L, con-taining dilute sulphuric acid to ehminate last traces of ammonia, and twotowers, M and N, filled with sticks of fused potassiimi hydroxide to absorbmoisture and carbon dioxide. The partially dried gas, after bubbling throughbromine in a small flask, P, passed into a second flask, Q, containing concentratedhydrobromic-acid solution in which washed red phosphorus was suspended, toconvert the bromine into hydrobromic acid. A U-tube, R, also containing redpho
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