Chromium(III) Hydroxide Precipitation

CrCl₃ + 3NaOH → Cr(OH)₃↓ + 3NaCl

Tổng quan

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]⁻.

Người tham gia

Vai trò	Chất	Hệ số	Trạng thái
Chất phản ứng	Sodium Hydroxide NaOH	3	(aq)
Sản phẩm	Sodium Chloride NaCl	3	(aq)

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

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

Tính chất

Loại: Precipitation
Thuận nghịch: Không
Năng lượng: Tỏa nhiệt
ΔH: -90,0 kJ/mol

Phản ứng liên quan

Aluminum Hydroxide Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Phosphate Precipitation (Bone Mineral) Lead Carbonate Precipitation Magnesium Hydroxide Precipitation Copper Sulfide Precipitation Cobalt(II) Hydroxide Precipitation Mercury(II) Sulfide Precipitation (Vermilion) 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.