4 KI + 2 CuSO4 2 CuI + I2 + 2 K2SO4

This is an oxidation-reduction (redox) reaction:

2 CuII + 2 e- 2 CuI (reduction)

2 I-I - 2 e- 2 I0 (oxidation)

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

Reactants:

  • KI
    • Names: Potassium iodide source: wikidata, accessed on: 2019-09-02, KI source: wikidata, accessed on: 2019-09-02, Thyrosafe source: wikidata, accessed on: 2019-09-02
  • CuSO4Copper(II) sulfate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02
    • Other names: Cupric sulphate source: wikipedia, accessed on: 2019-09-27source: ICSC, accessed on: 2019-09-04, Blue vitriol (pentahydrate) source: wikipedia, accessed on: 2019-09-27, Bluestone (pentahydrate) source: wikipedia, accessed on: 2019-09-27
    • Appearance: Gray-white (anhydrous) | blue (pentahydrate) source: wikipedia, accessed on: 2019-09-27; White hygroscopic crystals source: ICSC, accessed on: 2019-09-04

Products:

  • CuICopper(I) iodide source: wikipedia, accessed on: 2019-09-27
    • Other names: Cuprous iodide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02
    • Appearance: White powder | when impure: tan or brownish source: wikipedia, accessed on: 2019-09-27
  • I2
    • Names: Iodine source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02, Jod source: ICSC, accessed on: 2019-09-04, Iode source: ICSC, accessed on: 2019-09-04
    • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed on: 2019-09-04; Violet solid with a sharp, characteristic odor. source: NIOSH NPG, accessed on: 2019-09-02
  • K2SO4
    • Names: Potassium sulfate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Potassium sulphate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Dipotassium sulfate source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04
    • Appearance: White solid source: wikipedia, accessed on: 2019-09-27; Colourless-to-white crystals source: ICSC, accessed on: 2019-09-04