Method of Analysis.
The first three determinations were made exactly like those in the chloride method. The last two were also made in the same manner, only the washing of the precipitate was varied. After the silver bromide had been contracted by warming on a water-bath it was washed by decantation and then agitated violently with cold water to remove occluded nitrates, but it was then so finely divided that it could not be filtered. The artifice used by Stas to contract it a second time was to pass a current of steam into the milky liquid. This was tried here, but for some reason or other did not work very well, and considerable difficulty was had in filtering it. The results of the five determinations are tabulated below. All weighings are reduced to the vacuum standard on the basis of Sp. Gr. of CdBr2 = 4.6 and Sp. Gr. AgBr = 6.62.
| No. | CdBr2 | AgBr | H2O | Ex. AgNO3 | At. Wt. | Remarks |
|---|---|---|---|---|---|---|
| I | 4.39941 | 6.07204 | 112.43 | Distillate } | ||
| II | 3.18030 | 4.38831 | 112.42 | Residue } | ||
| III | 3.60336 | 4.97150 | 112.45 | Resublimed. | ||
| IV | 4.04240 | 5.58062 | 112.29 | |||
| V | 3.60505 | 4.97519 | 112.38 | |||
| Average | 112.394 | |||||