2 Cu(NO3)2 (aq) + 4 KI (aq) 2 CuI (s) + I2 (s) + 4 KNO3 (aq)

This is an oxidation-reduction (redox) reaction:

2 CuII + 2 e- 2 CuI (reduction)

2 I-I - 2 e- 2 I0 (oxidation)

Cu(NO3)2 is an oxidizing agent, KI is a reducing agent.

This is a precipitation reaction: CuI andI2 is the formed precipitate.

Reactants:

  • Cu(NO3)2Copper(II) nitrate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Cupric nitrate source: wikipedia, accessed: 2019-09-27, Nitrato de cobre (II) source: wikidata, accessed: 2019-09-02, Нитрат меди (II) (безводный) source: wikidata, accessed: 2019-09-02
    • Appearance: Blue crystals | hygroscopic source: wikipedia, accessed: 2019-09-27
  • KI
    • Names: Potassium iodide source: wikidata, accessed: 2019-09-02, KI source: wikidata, accessed: 2019-09-02, Thyrosafe source: wikidata, accessed: 2019-09-02

Products:

  • CuICopper(I) iodide source: wikipedia, accessed: 2019-09-27
    • Other names: Cuprous iodide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: White powder | when impure: tan or brownish source: wikipedia, accessed: 2019-09-27
  • I2
    • Names: Iodine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Jod source: ICSC, accessed: 2019-09-04, Iode source: ICSC, accessed: 2019-09-04
    • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed: 2019-09-04; Violet solid with a sharp, characteristic odor. source: NIOSH NPG, accessed: 2019-09-02
  • KNO3Potassium 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