The three series also differ when heated: the trimetallic salts, containing fixed bases are unaltered, whilst the monoand dimetallic salts yield metaand pyrophosphates respectively.
All soluble pyrophosphates when boiled with water for a long time are converted into orthophosphates.
On heating they yield phosphine and leave a residue of pyrophosphate, or a mixture of metaand pyrophosphates, with a little phosphorus.
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