. Carnegie Institution of Washington publication. . A REVISION OF THE ATOMIC WEIGHT OF BROMINE. THE SYNTHESIS OF SILVER BROMIDE AND THE RATIO OF SILVER BROMIDE TO SILVER CHLORIDE. INTRODUCTION. In numerous investigations in this laboratory upon the atomic weights of certain metals, in which metallic bromides were first titrated against the purest silver, and then the precipitated silver bromide was collected and weighed, the relation between the silver used in the titrations and the silver bromide ob- tained has )delded data from which the atomic weight of bromine may be calcu- lated. Furtherm
. Carnegie Institution of Washington publication. . A REVISION OF THE ATOMIC WEIGHT OF BROMINE. THE SYNTHESIS OF SILVER BROMIDE AND THE RATIO OF SILVER BROMIDE TO SILVER CHLORIDE. INTRODUCTION. In numerous investigations in this laboratory upon the atomic weights of certain metals, in which metallic bromides were first titrated against the purest silver, and then the precipitated silver bromide was collected and weighed, the relation between the silver used in the titrations and the silver bromide ob- tained has )delded data from which the atomic weight of bromine may be calcu- lated. Furthermore, in all these investigations, as a check upon the purity of the silver and bromine employed, silver bromide was synthesized directly from weighed quantities of silver and an excess of ammonium bromide or hydrobro- mic acid. Many of these results have already been collected and discussed by Richards,^ nevertheless they are cited in the following table together with a few more recent determinations. (See table on page 52.) From the first of these ratios the atomic weight of bromine, referred to silver , is found to be , and from the second Very recently, in experiments in which silver iodide was heated first in a cur- rent of air and bromine imtil the iodine was completely displaced, and then in a current of chlorine to displace the bromine, the ratio of silver bromide to silver chloride was determined in six cases. From the results of these experi- ments the atomic weight of bromine was calculated to be ,^ if the atomic weight of chlorine is assumed to be These values for bromine are in close agreement with those of Stas.' In his experiments weighed quantities of pure silver and bromine were first titrated against each other, and then the precipitate of silver bromide was collected and weighed. Of the four results by the first method, one should be rejected ac- cording to his own statements, since the bromine was not thoroughly dried. The r
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