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Excerpt from Further Researches Concerning Atomic Weights of Potassium, Silver, Chlorine, Bromine, Nitrogen, and Sulphur
The atomic weight of potassium is a chemical constant of unusual inter est and significance. Standing, as it does, in the middle of the series of five atomic weights of the most electro-positive metals substances which exhibit in a highly marked degree both similarity and progressive change in properties this number must be Of unusual importance in the search for that undiscovered mathematical relationship which undoubtedly exists between these constants. Moreover, the atomic weight of potassium is essentially bound up with the atomic weights of oxygen, chlorine, and silver, this group forming a fundamental basis in the calculation of nearly all the other atomic weights; so that a change in the atomic weight of potassium has a widely ramified effect on the whole table of atomic weights. If any further evidence of this fact were needed, the recent paper of R. W. Gray1 would furnish it.
The recent investigation upon the atomic weight of sodium by one of us in conjunction with Dr. R. C. Wells2 showed conclusively that Stas's work, upon which rested earlier knowledge, was somewhat at fault in several respects. The most serious of these errors were, first, the existence of impurity in Stas's silver; secondly, the fact that in his work solid salt was dropped into the argentic solution, causing occlusion of salt; and thirdlv inadequate knowledge concerning solutions of argentic chloride. In View Of these errors it seemed not impossible that a similar revision of potassium might likewise yield slightly lower results for potassium than had been found by this master of exact analysis. For this reason the present investigation was undertaken.
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