3 CaCr2O7 + 6 AlBr3 + 14 H3PO4 → 6 AlPO4 + 6 CrPO4 + Ca3(PO4)2 + 21 H2O + 9 Br2

This is an oxidation-reduction (redox) reaction:

18 Br-I - 18 e- → 18 Br0 (oxidation)

6 CrVI + 18 e- → 6 CrIII (reduction)

AlBr3 is a reducing agent, CaCr2O7 is an oxidizing agent.

Reactants:

  • CaCr2O7
    • Names: Calcium dichromate source: wikidata, accessed: 2019-09-03
  • AlBr3 – Aluminium bromide source: wikipedia, accessed: 2019-09-27
    • Other names: Aluminic bromide source: wikipedia, accessed: 2019-09-27, Aluminum bromide source: wikidata, accessed: 2019-09-02
    • Appearance: White to pale yellow powder 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:

  • AlPO4
    • Names: Aluminium phosphate source: wikipedia, accessed: 2019-09-27, Aluminum phosphate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Aluminium monophosphate source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04
    • Appearance: White, crystalline powder source: wikipedia, accessed: 2019-09-27; White crystalline powder source: ICSC, accessed: 2019-09-04
  • CrPO4 – Chromium(III) phosphate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-03
    • Other names: Chromium phosphate source: wikipedia, accessed: 2019-09-27, Chromium monophosphate source: wikipedia, accessed: 2019-09-27, Chromium orthophosphate source: wikipedia, accessed: 2019-09-27, Chromic phosphate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-03
  • Ca3(PO4)2 – Tricalcium bis(phosphate) source: wikipedia, accessed: 2019-09-28
    • Other names: Tricalcium phosphate source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02, Tribasic calcium phosphate source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02, Bone phosphate of lime source: wikidata, accessed: 2019-09-02
    • Appearance: White amorphous powder source: wikipedia, accessed: 2019-09-28
  • 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
  • Br2
    • Names: Bromine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular bromine source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Fuming red-to-brown liquid with pungent odour source: ICSC, accessed: 2019-09-04; Dark reddish-brown, fuming liquid with suffocating, irritating fumes. source: NIOSH NPG, accessed: 2019-09-02