Chromate-Dichromate Equilibrium

概要

Chromate (yellow, CrO₄²⁻) converts to dichromate (orange, Cr₂O₇²⁻) in acidic solution and vice versa in basic solution. This pH-dependent equilibrium involves condensation of two tetrahedral chromate units. While chromium remains at +6 throughout, this equilibrium is fundamental to Cr(VI) redox chemistry.

参加者

日常の例

Adding acid to yellow potassium chromate solution turns it orange, and adding base reverses it, demonstrating Le Chatelier's principle.

産業上の重要性

クロム酸塩/二クロム酸塩平衡は、クロムメッキ、皮革なめし、そしてCr(VI)による環境汚染を理解する上で重要です。