6 CuSO4 + 2 KC4H5O6 + 10 KOH → 3 Cu2O + 6 K2SO4 + 2 C4H5O7 + 5 H2O

This is an oxidation-reduction (redox) reaction:

6 CuII + 6 e- → 6 CuI (reduction)

8 C3/2 - 6 e- → 8 C9/4 (oxidation)

CuSO4 is an oxidizing agent, KC4H5O6 is a reducing agent.

Reactants:

  • CuSO4 – Copper(II) sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Cupric sulphate source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Blue vitriol (pentahydrate) source: wikipedia, accessed: 2019-09-27, Bluestone (pentahydrate) source: wikipedia, accessed: 2019-09-27
    • Appearance: Gray-white (anhydrous) | blue (pentahydrate) source: wikipedia, accessed: 2019-09-27; White hygroscopic crystals source: ICSC, accessed: 2019-09-04
  • KC4H5O6
    • Names: Potassium bitartrate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Potassium hydrogen tartrate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Cream of tartar source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: White crystalline powder source: wikipedia, accessed: 2019-09-27
  • KOH – Potassium hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Caustic potash source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Lye source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Potash lye source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: White solid, deliquescent source: wikipedia, accessed: 2019-09-27; White hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04; Odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets. [Note: May be used as an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • Cu2O – Copper(I) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Cuprous oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Dicopper oxide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Cuprite source: wikipedia, accessed: 2019-09-27
    • Appearance: Brownish-red solid source: wikipedia, accessed: 2019-09-27; Yellow, red or brown crystalline powder source: ICSC, accessed: 2019-09-04
  • K2SO4
    • Names: Potassium sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Potassium sulphate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Dipotassium sulfate source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Appearance: White solid source: wikipedia, accessed: 2019-09-27; Colourless-to-white crystals source: ICSC, accessed: 2019-09-04
  • C4H5O7
  • 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