3 Cu(OH)2 + 2 H3PO4 → Cu3(PO4)2 + 6 H2O

This is an acid-base reaction (neutralization): Cu(OH)2 is a base, H3PO4 is an acid.

Reactants:

  • Cu(OH)2 – Copper(II) hydroxide source: wikipedia, accessed: 2019-09-27
    • Other names: Cupric hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Cu(OH)2 source: wikidata, accessed: 2019-09-02
    • Appearance: Blue or blue-green solid source: wikipedia, accessed: 2019-09-27
  • H3PO4
    • Names: Phosphoric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Orthophosphoric acid source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Phosphoric(V) acid source: wikidata, accessed: 2019-09-02
    • Appearance: Hygroscopic colourless crystals source: ICSC, accessed: 2019-09-04; Thick, colorless, odorless, crystalline solid. [Note: Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • Cu3(PO4)2 – Copper(II) phosphate source: wikipedia, accessed: 2019-09-27
    • Other names: Tricopper diphosphate source: wikipedia, accessed: 2019-09-27, Tricopper bis(orthophosphate) source: wikipedia, accessed: 2019-09-27, Cupric phosphate source: wikidata, accessed: 2019-09-02
    • Appearance: Light bluish-green powder (anhydrous) | blue or olive crystals (trihydrate) source: wikipedia, accessed: 2019-09-27
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27