Cr2O3 + 3 KNO3 + 2 K2CO3 2 K2CrO4 + 2 CO2 + 3 KNO2

This is an oxidation-reduction (redox) reaction:

3 NV + 6 e- 3 NIII (reduction)

2 CrIII - 6 e- 2 CrVI (oxidation)

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

Reactants:

  • Cr2O3
    • Names: Chromium(III) oxide source: wikipedia, accessed on: 2019-09-27, Chromium sesquioxide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Chromia source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02
    • Appearance: Light to dark green, fine crystals source: wikipedia, accessed on: 2019-09-27; Light-to-dark-green powder source: ICSC, accessed on: 2019-09-04
  • KNO3Potassium nitrate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04
    • Other names: Saltpeter source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Saltpetre source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Nitrate of potash source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02
    • Appearance: White solid source: wikipedia, accessed on: 2019-09-27; Colourless-to-white crystalline powder source: ICSC, accessed on: 2019-09-04
  • K2CO3Potassium carbonate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02
    • Other names: Carbonate of potash source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Dipotassium carbonate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Sub-carbonate of potash source: wikipedia, accessed on: 2019-09-27
    • Appearance: White, hygroscopic solid source: wikipedia, accessed on: 2019-09-27; Colourless hygroscopic crystals or hygroscopic white powder source: ICSC, accessed on: 2019-09-04

Products:

  • K2CrO4Potassium chromate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04
    • Other names: Chromic acid source: wikipedia, accessed on: 2019-09-27, (K2CrO4) source: wikipedia, accessed on: 2019-09-27, Dipotassium salt source: wikipedia, accessed on: 2019-09-27
    • Appearance: Yellow powder source: wikipedia, accessed on: 2019-09-27; Yellow crystals source: ICSC, accessed on: 2019-09-04
  • CO2
    • Names: Carbon dioxide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02, CO2 source: wikidata, accessed on: 2019-09-02, Carbonic acid gas source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed on: 2019-09-27; Odourless colourless compressed liquefied gas source: ICSC, accessed on: 2019-09-04; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.] source: NIOSH NPG, accessed on: 2019-09-02
  • KNO2
    • Names: Potassium nitrite source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Nitrous acid potassium salt source: ICSC, accessed on: 2019-09-04
    • Appearance: White or slight yellow solid | deliquescent source: wikipedia, accessed on: 2019-09-27; White-to-yellow deliquescent solid in various forms source: ICSC, accessed on: 2019-09-04