Chromium was burned in a chlorine atmosphere. Potassium hydroxide was added dropwise to the formed salt until the precipitation ceased

bystudin | November 11, 2020 | Education

Chromium was burned in a chlorine atmosphere. Potassium hydroxide was added dropwise to the formed salt until the precipitation ceased. The resulting precipitate was oxidized with hydrogen peroxide in a potassium hydroxide medium and evaporated. An excess of a hot concentrated hydrochloric acid solution was added to the resulting solid residue. Write the equations for the described reactions.

2Cr + 3Cl2 → 2CrCl2
CrCl3 + 2KOH → Cr(OH)3↓ + 3KCl
2Cr(OH)3 + 3H2O2 + 4KOH → 2K2CrO4 + 8H2O
2K2CrO4 + 16HCl → 2CrCl3 + 4KCl + 3Cl2↑ + 8H2O

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