Silver Chromate Precipitation

2AgNO3 + K2CrO4 → Ag2CrO4↓ + 2KNO3

Übersicht

Silver nitrate reacts with potassium chromate to form a brick-red precipitate of silver chromate (Ksp = 1.1 × 10⁻¹²). This reaction is the basis of the Mohr method for determining chloride concentration by titration with AgNO₃ using K₂CrO₄ indicator.

Teilnehmer

Rolle Substanz Koeffizient Zustand
Reaktant Silver Nitrate AgNO₃ 2 (aq)
Produkt Potassium Nitrate KNO₃ 2 (aq)

Alltägliches Beispiel

The Mohr titration is used to measure salt content in food, measuring chloride by adding silver nitrate until the red silver chromate endpoint appears.

Industrielle Bedeutung

The Mohr chloride titration is a standard method in water quality analysis, food science, and in the cement industry.

Eigenschaften

Typ
Precipitation
Reversibel
Nein
Energie
Exotherm
ΔH
-35,0 kJ/mol

Verwandte Reaktionen

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

Frequently Asked Questions

What is the equation for Silver Chromate Precipitation?
The balanced equation is: 2AgNO₃ + K₂CrO₄ → Ag₂CrO₄↓ + 2KNO₃.
What type of reaction is Silver Chromate Precipitation?
Silver Chromate Precipitation is a precipitation reaction.
Is Silver Chromate Precipitation exothermic or endothermic?
Silver Chromate Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -35.0 kJ/mol.