2 FeSO4 (aq) + K2S2O8 (aq) Fe2(SO4)3 (s) + K2SO4 (aq)

This is an oxidation-reduction (redox) reaction:

2 SVII + 2 e- 2 SVI (reduction)

2 FeII - 2 e- 2 FeIII (oxidation)

K2S2O8 is an oxidizing agent, FeSO4 is a reducing agent.

This is a precipitation reaction: Fe2(SO4)3 is the formed precipitate.

Reactants:

  • FeSO4Iron(II) sulphate source: wikipedia, accessed: 2019-09-27
    • Other names: Iron(II) sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Ferrous sulfate source: wikipedia, accessed: 2019-09-27, Green vitriol source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystals (anhydrous) | White-yellow crystals (monohydrate) | Blue-green crystals (heptahydrate) source: wikipedia, accessed: 2019-09-27
  • K2S2O8
    • Names: Potassium persulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Potassium peroxydisulfate source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Anthion source: wikipedia, accessed: 2019-09-27
    • Appearance: White powder source: wikipedia, accessed: 2019-09-27; White crystals source: ICSC, accessed: 2019-09-04

Products:

  • Fe2(SO4)3Iron(III) sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Ferric sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Sulfuric acid source: wikipedia, accessed: 2019-09-27, Iron(3+) salt (3:2) source: wikipedia, accessed: 2019-09-27
    • Appearance: Grayish-white crystals source: wikipedia, accessed: 2019-09-27
  • 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