Question

chemical equation for a method of preparation of Potassium dichromate is its reaction with acidic Sulphur Dioxide (SO2) and HCL​

Answer 1

Answer:

The reaction is reversible. Treatment with cold sulfuric acid gives red crystals of chromic anhydride (chromium trioxide, CrO3): K2Cr2O7 + 2 H2SO4 → 2 CrO3 + 2 KHSO4 + H2O.

Chemical formula: K2Cr2O7

Solubility in water: 4.9 g/100 mL (0 °C); 13 g/100 mL (20 °C); 102 g/100 mL (100 °C)

Other cations: Ammonium dichromate; Sodium dichromate

Appearance: red-orange crystalline solid

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