Chromium(III) Hydroxide Precipitation

CrCl3 + 3NaOH → Cr(OH)3↓ + 3NaCl

अवलोकन

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]⁻.

प्रतिभागी

भूमिका पदार्थ गुणांक अवस्था
अभिकारक Sodium Hydroxide NaOH 3 (aq)
उत्पाद Sodium Chloride NaCl 3 (aq)

रोजमर्रा का उदाहरण

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

औद्योगिक महत्व

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

गुण

प्रकार
Precipitation
प्रतिवर्ती
नहीं
ऊर्जा
ऊष्माक्षेपी
ΔH
-90.0 kJ/mol

संबंधित अभिक्रियाएँ

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.