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Tetra Sodium Phosphate
Pyro' is the chemical prefix for oxo acid formed through the loss of one water molecule from two molecules of an ortho acid (dehydration of two molecules by heating). Pyrosulphuric acid is an example ( 2H2SO4 - H2O = H2S2O7). Otho acid is the compound fully hydrated acid or of its salts. Orthophosphoric acid is an example (H3PO4 = P2O5.3H2O), in contrast to the less hydrated form, metaphosphoric acid (HPO3 = P2O5.H2O).
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