2 K4[Fe(CN)6] (aq) + H2SO4 (aq) + H2O2 (aq) → 2 K3[Fe(CN)6] (aq) + K2SO4 (aq) + 2 H2O (l)

This is an oxidation-reduction (redox) reaction:

2 FeII - 2 e- → 2 FeIII (oxidation)

2 O-I + 2 e- → 2 O-II (reduction)

K4[Fe(CN)6] is a reducing agent, H2O2 is an oxidizing agent.

Reactants:

  • K4[Fe(CN)6] – Potassium hexacyanidoferrate(II) source: wikipedia, accessed: 2019-09-27
    • Other names: Potassium ferrocyanide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, (Yellow) Prussiate of Potash source: wikipedia, accessed: 2019-09-27, Potassium hexacyanoferrate (II) trihydrate source: wikipedia, accessed: 2019-09-27
    • Appearance: Light yellow, crystalline granules source: wikipedia, accessed: 2019-09-27
  • H2SO4 – Sulfuric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Oil of vitriol source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Sulfuric acid, concentrated (> 51% and < 100%) source: ICSC, accessed: 2019-09-04, H2SO4 source: wikidata, accessed: 2019-09-07
    • Appearance: Clear, colorless liquid source: wikipedia, accessed: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02
  • H2O2 – Hydrogen 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

Products:

  • K3[Fe(CN)6] – Potassium hexacyanoferrate(III) source: wikipedia, accessed: 2019-09-27
    • Other names: Potassium ferricyanide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Red prussiate of Potash source: wikipedia, accessed: 2019-09-27, Prussian red source: wikipedia, accessed: 2019-09-27
    • Appearance: Deep red crystals, sometimes small pellets, orange to dark red powder source: wikipedia, accessed: 2019-09-27; Red 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
  • 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