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Disodium pyrophosphate

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Disodium pyrophosphate

Molecular formula: H2Na2O7P2 CAS# 7758-16-9
Categories: Inorganic salt , Acid salt
Diphosphoric acid, disodium salt
Disodium acid pyrophosphate
Disodium dihydrogen diphosphate
Disodium dihydrogen pyrophosphate
Disodium diphosphate
Disodium pyrophosphate [Wiki]
E 450(i)
E 450a
Sodium acid pyrophosphate

Variants of the formula:

Na^+/0O`^-# -P<`|HO><||O>-O-P<`|OH><||O>-O^-\0Na^+
Elemental composition
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Symbol Element Atomic weight Number of atoms Mass percent

Reactions in which Disodium pyrophosphate is involved

  • H4P2O7 + 2{M}OH -> {M}2H2P2O7 + 2H2O , where M = Na
  • 2NaH2PO4 "160^oC"--> Na2H2P2O7 + H2O
  • H4P2O7 + 2NaOH -> Na2H2P2O7 + 2H2O
  • Na4P2O7 + 2CH3COOH "0-10^oC"--> Na2H2P2O7 + 2CH3COONa
  • Na2H2P2O7 "220-250^oC"--> 2NaPO3 + H2O