. Carnegie Institution of Washington publication. OF THALLIUM, INDIUM, AND TIN 21 hours later gave the values and , in mean , exactly the same as before. In subsequent work the agreements were of this order of accuracy; usually average values alone will be given. It is worthy of remark in this connection that the electrolyte was not found to be the least alkaline to phenolphthalein after thus standing for 48 hours over a thallium amalgam. This fact is very satisfactory, not only with regard to thallium, but also in its implication concerning the probable integrity of amalgam
. Carnegie Institution of Washington publication. OF THALLIUM, INDIUM, AND TIN 21 hours later gave the values and , in mean , exactly the same as before. In subsequent work the agreements were of this order of accuracy; usually average values alone will be given. It is worthy of remark in this connection that the electrolyte was not found to be the least alkaline to phenolphthalein after thus standing for 48 hours over a thallium amalgam. This fact is very satisfactory, not only with regard to thallium, but also in its implication concerning the probable integrity of amalgams of less easily oxidized metals, whose oxides are less easily detected. It is interesting to compare the result with the ideal value calculated from the gas law. The theoretical potential, calculated according to the formula v= (°) j c* 96,530 Cn is millivolts. This is millivolts, or nearly 10 per cent, less than the observed value Having thus cleared the way by this preliminary work, four series of more accurate measurements were made. Four multiple cells containing thallium amalgam, designated A, B, C, and D, were prepared. In each case an amalgam prepared electrolytically was placed in cup I; and cups 2, 3, and 4 were filled with the same amalgam diluted (in an atmosphere of hydrogen) with weighed amounts of mercury. The " parent amalgam " in cups Ai and Bi was made by depositing in grams of mercury the amount of thallium equivalent to gram of silver. This amalgam was diluted as follows: grams of amalgam. grams of mercury. 13-272 + in A2 IS-679 4I-938 A3 B2 63 64 The " parent amalgam " in cup Ci was made by depositing in grams of mercury the amount of thallium equivalent to grams of silver. This amalgam was diluted as follows: grams of amalgam. grams of mercury. + in C2 75-495 C3 €4 Finally the "
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