. Carnegie Institution of Washington publication. OF ZINC, CADMIUM, LEAD, COPPER, AND LITHIUM ELECTROMOTIVE FORCE BETWEEN ZINC AMALGAMS. The first series of results with zinc amalgams, although not of sufficient accuracy to yield trustworthy temperature coefficients, are worth recording as a corroboration of the results obtained during the previous investigation of Richards and Forbes. In the first case the most concentrated amalgam contained per cent of zinc. It was placed undiluted in the first cup of the multiple cell described in the foregoing paper,35 was diluted with mercury in the
. Carnegie Institution of Washington publication. OF ZINC, CADMIUM, LEAD, COPPER, AND LITHIUM ELECTROMOTIVE FORCE BETWEEN ZINC AMALGAMS. The first series of results with zinc amalgams, although not of sufficient accuracy to yield trustworthy temperature coefficients, are worth recording as a corroboration of the results obtained during the previous investigation of Richards and Forbes. In the first case the most concentrated amalgam contained per cent of zinc. It was placed undiluted in the first cup of the multiple cell described in the foregoing paper,35 was diluted with mercury in the third and fourth cups, and finally the parent amalgam was again put undiluted in the remaining second cup, in order to be sure that no change had taken place in the amalgam during the filling of the cell, and also that the amalgam had been in the first place thoroughly mixed. This precaution was usually taken in the subsequent work also, but only in one case, mentioned later, was a difference greater than volt ever found between the first and the last portions of amalgam. As is shown below, the maximum difference in the present case was only one millionth of one volt. In addition to this series of measurements, another was made upon three more dilute amalgams, in order to show the increasingly near approach of the potential to the gas law. Table 6 gives both series of measure- ments at 30°. The details of dilution, etc., need not be given as regards these preliminary results. The theoretical potential given below is calcu- lated according to the simple concentration equation. TABLE 6.—Preliminary Electrical Measurement of Zinc Amalgams. Designation of cup containing amalgam. Approximate per cent of zinc in amalgams. Exact value of \og — Cn Electromotive force, in millivolts, be- tween each pair of cups. 30°C. Observed. Theoretical. Difference. Kl , | ' ' . 1 ' 0 . 0000
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