Chromium(III) Hydroxide Precipitation

CrCl₃ + 3NaOH → Cr(OH)₃↓ + 3NaCl

Descripción general

Chromium(III) chloride reacts with sodium hydroxide to form a green gelatinous precipitate of chromium(III) hydroxide (Ksp = 6.3 × 10⁻³¹). Cr(OH)₃ is amphoteric, dissolving in both excess acid and excess NaOH. In excess NaOH, it forms the green chromite ion [Cr(OH)₄]⁻.

Participantes

Rol	Sustancia	Coeficiente	Estado
Reactivo	Sodium Hydroxide NaOH	3	(aq)
Producto	Sodium Chloride NaCl	3	(aq)

Ejemplo cotidiano

The green color of some gemstones like emerald is due to chromium(III) ions, the same oxidation state that produces this green precipitate.

Importancia industrial

La precipitación del hidróxido de cromo(III) se utiliza en la eliminación de cromo de aguas residuales industriales, particularmente de efluentes de cromado y curtido de cuero.

Propiedades

Tipo: Precipitation
Reversible: No
Energía: Exotérmico
ΔH: -90,0 kJ/mol

Reacciones relacionadas

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Fluoride Precipitation (Fluorite) Calcium Phosphate Precipitation (Bone Mineral) Lead Carbonate Precipitation Lead Chloride Precipitation Calcium Carbonate Precipitation Iron(III) Hydroxide Precipitation

Frequently Asked Questions

What is the equation for Chromium(III) Hydroxide Precipitation?

The balanced equation is: CrCl₃ + 3NaOH → Cr(OH)₃↓ + 3NaCl.

What type of reaction is Chromium(III) Hydroxide Precipitation?

Chromium(III) Hydroxide Precipitation is a precipitation reaction.

Is Chromium(III) Hydroxide Precipitation exothermic or endothermic?

Chromium(III) Hydroxide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -90.0 kJ/mol.