Note 8 — Chapter VI · TTHE COMPOUNDS OF NITROGEN WITH HYDROGEN AND OXYGEN

Below 15° (according to Isambert), the compound AgCl,3NH3 is formed, and above 20° the compound 2AgCl,3NH3. The tension of the ammonia evolved from the latter substance is equal to the atmospheric pressure at 68°, whilst for AgCl,3NH3 the pressures are equal at about 20°; consequently, at higher temperatures it is greater than the atmospheric pressure, whilst at lower temperatures the ammonia is absorbed and forms this compound. Consequently, all the phenomena of dissociation are here clearly to be observed. Joannis and Croisier (1894) investigated similar compounds with AgBr, AgI, AgCN and AgNO3, and found that they all give definite compounds with NH3, for instance AgBr,3NH3, 2AgBr,3NH3 and AgBr,2NH3; they are all colourless, solid substances which decompose under the atmospheric pressure at +3·5, +34° and +51°.