2 HCl (aq) + H2O2 (aq) + CuS (s) 2 H2O (l) + S (s) + CuCl2 (aq)

This is an oxidation-reduction (redox) reaction:

S-II - 2 e- S0 (oxidation)

2 O-I + 2 e- 2 O-II (reduction)

CuS is a reducing agent, H2O2 is an oxidizing agent.

Reactants:

  • HClChlorane source: wikipedia, accessed: 2019-09-27, Hydrogen chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Hydrochloric acid source: wikipedia, accessed: 2019-09-27source: NIOSH NPG, accessed: 2019-09-02, Hydrochloric acid gas source: wikipedia, accessed: 2019-09-27, HCl source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless, transparent liquid, fumes in air if concentrated source: wikipedia, accessed: 2019-09-27; Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
  • H2O2Hydrogen peroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Dioxidane source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Oxidanyl source: wikipedia, accessed: 2019-09-27, Perhydroxic acid source: wikipedia, accessed: 2019-09-27
    • Appearance: Very light blue color; colorless in solution source: wikipedia, accessed: 2019-09-27; Colourless liquid source: ICSC, accessed: 2019-09-04; Colorless liquid with a slightly sharp odor. [Note: The pure compound is a crystalline solid below 12°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02
  • CuSCopper sulfide source: wikipedia, accessed: 2019-09-27
    • Other names: Copper monosulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Covellite source: wikipedia, accessed: 2019-09-27, Copper(II) sulfide source: wikipedia, accessed: 2019-09-27, Cupric sulfide source: wikipedia, accessed: 2019-09-27
    • Appearance: Black powder or lumps source: wikipedia, accessed: 2019-09-27

Products:

  • 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
  • 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
  • CuCl2
    • Names: Copper(II) chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Cupric chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Copper chloride source: wikidata, accessed: 2019-09-02
    • Appearance: Yellow-brown solid (anhydrous) | blue-green solid (dihydrate) source: wikipedia, accessed: 2019-09-27