S + 2 K → K2S

This is an oxidation-reduction (redox) reaction:

S0 + 2 e- → S-II (reduction)

2 K0 - 2 e- → 2 KI (oxidation)

S is an oxidizing agent, K is a reducing agent.

Reactants:

  • S
    • Names: Sulfur source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, S source: wikidata, accessed: 2019-09-07, Sulphur source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04
    • Appearance: Yellow solid in various forms source: ICSC, accessed: 2019-09-04
  • K
    • Names: Potassium source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, K source: wikidata, accessed: 2019-09-07, Element 19 source: wikidata, accessed: 2019-09-07, Kalium source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04
    • Appearance: White-to-grey lumps source: ICSC, accessed: 2019-09-04

Products:

  • K2S – Potassium sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Dipotassium monosulfide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Dipotassium sulfide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Potassium monosulfide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04
    • Appearance: Pure: colourless | impure: yellow-brown source: wikipedia, accessed: 2019-09-27; Hygroscopic white crystals with characteristic odour. turns red or brown on exposure to air source: ICSC, accessed: 2019-09-04