Chromate-Dichromate Equilibrium

概述

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.

参与者

日常示例

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

工业重要性

铬酸盐/重铬酸盐平衡在电镀铬、鞣革,以及理解Cr(VI)环境污染方面都非常重要。