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A Manual of the Chemistry of the Carbon Compounds

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TUB CARBON COMPOUNDS. 21<br />

To this solution platinio chloride was added, and, after evaporation on<br />

a water-bath, <strong>the</strong> excess <strong>of</strong> platinic chloride was washed out with<br />

alcohol. On igniting <strong>the</strong> remaining double salt, 0-2750 <strong>of</strong> platinum<br />

was left behind. Now as <strong>the</strong> salt (NH4 Cl)2 + Pt Cl4 contains 2 atoms<br />

or 28 parts by weight <strong>of</strong> nitrogen for each atom <strong>of</strong> platinum, or<br />

197-5 parts by weight, 100 parts <strong>of</strong> caffeine contain :—<br />

0-2750 x 28 x 100 no A _, , .<br />

0-135O"x 1975 = 28

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