Chromium(III) Hydroxide Precipitation

CrCl₃ + 3NaOH → Cr(OH)₃↓ + 3NaCl

Genel Bakış

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]⁻.

Katılımcılar

Rol	Madde	Katsayı	Hal
Reaktan	Sodium Hydroxide NaOH	3	(aq)
Ürün	Sodium Chloride NaCl	3	(aq)

Günlük Örnek

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

Endüstriyel Önemi

Chromium(III) hydroxide precipitation is used in chromium removal from industrial wastewater, particularly from chrome plating and leather tanning effluents.

Özellikler

Tür: Precipitation
Geri Dönüşümlü: Hayır
Enerji: Ekzotermik
ΔH: -90,0 kJ/mol

İlgili Reaksiyonlar

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.