Group IA phosphates

The rate-limiting step in the reaction 2 NaH2P04 = Na2H2P207 + H20 

It is believed [1278] that an amorphous phase is transiently formed during the vacuum decomposition of j3-Na2H2P207 (and probably also on reaction of the (5 form) and this is responsible for the slow reaction rate. Crystallization of the disorganized phase into condensed polyphosphates 

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