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Ca3PO42

Source : Webster's Revised Unabridged Dictionary (1913)

Superphosphate \Su`per*phos"phate\, n. (Chem.)
   An acid phosphate.

   {Superphosphate of lime} (Com. Chem.), a fertilizer obtained
      by trating bone dust, bone black, or phosphorite with
      sulphuric acid, whereby the insoluble neutral calcium
      phosphate, {Ca3(PO4)2}, is changed to the primary or acid
      calcium phosphate {Ca(H2PO4)2}, which is soluble and
      therefore available for the soil.
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