4 NH4OH (l) + MnCl2 (aq) + Br2 (aq) → 2 NH4Br (aq) + 2 NH4Cl (aq) + MnO2 (s) + 2 H2O (l)

This is an oxidation-reduction (redox) reaction:

2 Br0 + 2 e- → 2 Br-I (reduction)

MnII - 2 e- → MnIV (oxidation)

Br2 is an oxidizing agent, MnCl2 is a reducing agent.

Reactants:

  • NH4OH
    • Names: Ammonium hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07, Ammonia solution source: wikidata, accessed: 2019-09-07, Ammonium hydroxide (10%-35% solution) source: ICSC, accessed: 2019-09-04
    • Appearance: Colourless liquid source: wikipedia, accessed: 2019-09-27; Very volatile colourless ammonia solution in water with pungent odour source: ICSC, accessed: 2019-09-04
  • MnCl2 – Manganese(II) chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Manganese dichloride source: wikipedia, accessed: 2019-09-27
    • Other names: Manganous chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Manganous dichloride source: wikidata, accessed: 2019-09-02, Manganese(II) chloride (1:2) source: wikidata, accessed: 2019-09-02
    • Appearance: Pink solid (tetrahydrate) source: wikipedia, accessed: 2019-09-27
  • Br2
    • Names: Bromine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular bromine source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Fuming red-to-brown liquid with pungent odour source: ICSC, accessed: 2019-09-04; Dark reddish-brown, fuming liquid with suffocating, irritating fumes. source: NIOSH NPG, accessed: 2019-09-02

Products:

  • NH4Br – Ammonium bromide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: NH4Br source: wikidata, accessed: 2019-09-02
    • Appearance: White powder, hygroscopic source: wikipedia, accessed: 2019-09-27
  • NH4Cl – Ammonium 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: Sal ammoniac source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Salmiac source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Nushadir salt source: wikipedia, accessed: 2019-09-27
    • Appearance: White solid, hygroscopic source: wikipedia, accessed: 2019-09-27; Odourless colourless-to-white hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04; Finely divided, odorless, white particulate dispersed in air. source: NIOSH NPG, accessed: 2019-09-02
  • MnO2 – Manganese oxide source: wikipedia, accessed: 2019-09-27, Manganese(IV) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Manganese dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Pyrolusite source: wikipedia, accessed: 2019-09-27, Hyperoxide of manganese source: wikipedia, accessed: 2019-09-27
    • Appearance: Brown-black solid source: wikipedia, accessed: 2019-09-27; Black-to-brown powder 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