Ca₃P₂ + 8 Cl₂ + 8 H₂O → 16 HCl + Ca₃(PO₄)₂

This is an oxidation-reduction (redox) reaction:

Ca₃P₂ is a reducing agent, Cl₂ is an oxidizing agent.

Reactants:

• Ca₃P₂ – Calcium phosphide
  • Other names: Photophor , CP , Polythanol , Tricalcium diphosphide
  • Appearance: Red-brown crystalline powder or grey lumps ; Red-brown crystalline powder or grey lumps
• Cl₂
  • Names: Chlorine , Molecular chlorine
  • Appearance: Greenish-yellow compressed liquefied gas with pungent odour ; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• Ca₃(PO₄)₂ – Tricalcium bis(phosphate)
  • Other names: Tricalcium phosphate , Tribasic calcium phosphate , Bone phosphate of lime ... show moreBCP , TCP , Calcium phosphate tribasic , Synthos , Tricalcium orthophosphate , Tricalcium diphosphate , Calcium phosphate , Tertiary calcium phosphate , Calcigenol Simple , Calcium orthophosphate , Ca3(PO4)2 , E341iii show less
  • Appearance: White amorphous powder