Cr2O3 + 2 NaCO3 + 3 KNO3 → 2 NaCrO4 + 3 KNO2 + 2 CO2

This is an oxidation-reduction (redox) reaction:

2 CV + 2 e- → 2 CIV (reduction)

3 NV + 6 e- → 3 NIII (reduction)

2 CrIII - 8 e- → 2 CrVII (oxidation)

NaCO3 is an oxidizing agent, KNO3 is an oxidizing agent, Cr2O3 is a reducing agent.

Reactants:

  • Cr2O3
    • Names: Chromium(III) oxide source: wikipedia, accessed: 2019-09-27, Chromium sesquioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Chromia source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: Light to dark green, fine crystals source: wikipedia, accessed: 2019-09-27; Light-to-dark-green powder source: ICSC, accessed: 2019-09-04
  • NaCO3
  • KNO3 – Potassium nitrate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Saltpeter source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Saltpetre source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Nitrate of potash source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: White solid source: wikipedia, accessed: 2019-09-27; Colourless-to-white crystalline powder source: ICSC, accessed: 2019-09-04

Products:

  • NaCrO4
  • KNO2
    • Names: Potassium nitrite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Nitrous acid potassium salt source: ICSC, accessed: 2019-09-04
    • Appearance: White or slight yellow solid | deliquescent source: wikipedia, accessed: 2019-09-27; White-to-yellow deliquescent solid in various forms source: ICSC, accessed: 2019-09-04
  • CO2
    • Names: Carbon dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, {{plainlist| source: wikipedia, accessed: 2019-09-27, CO2 source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Odourless colourless compressed liquefied gas source: ICSC, accessed: 2019-09-04; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.] source: NIOSH NPG, accessed: 2019-09-02
Warning: Unknown compound 'NaCO3'. Did you mean NaCo3?
Warning: Unknown compound 'NaCrO4'