NaH2PO4
(Primary phosphate) on heating undergo polymerization and form a stable hexamer
salt (sodiummetaphosphate) which known as
“CALGON” which also use as water softener. And Na2HPO4 (Secondary
phosphate) on heating dimerised to form Sodium
pyrophosphate while no effect
on (Na3PO4 )tertiary phosphate.
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