Equilibrio cromato-dicromato

2CrO42− + 2H+ ⇌ Cr2O72− + H2O

Descripción general

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.

Participantes

Rol Sustancia Coeficiente Estado
Producto Agua H₂O 1 (l)

Ejemplo cotidiano

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

Importancia industrial

El equilibrio cromato/dicromato es importante en el cromado, el curtido del cuero y en la comprensión de la contaminación ambiental por Cr(VI).

Preguntas frecuentes

What is the equation for Equilibrio cromato-dicromato?
The balanced equation is: 2CrO₄²⁻ + 2H⁺ ⇌ Cr₂O₇²⁻ + H₂O.
What type of reaction is Equilibrio cromato-dicromato?
Equilibrio cromato-dicromato is a redox reaction. It is reversible under certain conditions.
Is Equilibrio cromato-dicromato exothermic or endothermic?
Equilibrio cromato-dicromato is exothermic (releases energy). The enthalpy change (ΔH) is -14.0 kJ/mol.