3 C (s) + 2 K2Cr2O7 (aq) + H2O (l) 2 Cr2O3 (s) + K2CO3 (aq) + 2 KHCO3 (aq)

This is an oxidation-reduction (redox) reaction:

3 C0 - 12 e- 3 CIV (oxidation)

4 CrVI + 12 e- 4 CrIII (reduction)

C is a reducing agent, K2Cr2O7 is an oxidizing agent.

Reactants:

  • C
    • Names: Carbon black source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Acetylene black source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Channel black source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Odourless black pellets or extremely fine powder source: ICSC, accessed: 2019-09-04; Black, odorless solid. source: NIOSH NPG, accessed: 2019-09-02
  • K2Cr2O7Potassium dichromate(VI) source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Potassium dichromate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Chromium potassium oxide source: wikidata, accessed: 2019-09-02, Dipotassium dichromium heptaoxide source: wikidata, accessed: 2019-09-02
    • Appearance: Red-orange crystalline solid source: wikipedia, accessed: 2019-09-27; Orange-to-red crystals source: ICSC, accessed: 2019-09-04
  • H2OWater, 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

Products:

  • 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
  • K2CO3Potassium carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Carbonate of potash source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Dipotassium carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Sub-carbonate of potash source: wikipedia, accessed: 2019-09-27
    • Appearance: White, hygroscopic solid source: wikipedia, accessed: 2019-09-27; Colourless hygroscopic crystals or hygroscopic white powder source: ICSC, accessed: 2019-09-04
  • KHCO3Potassium hydrogen carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Potassium bicarbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Potassium acid carbonate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, KHCO3 source: wikidata, accessed: 2019-09-02
    • Appearance: White crystals source: wikipedia, accessed: 2019-09-27