Silver Chromate Precipitation

2AgNO₃ + K₂CrO₄ → Ag₂CrO₄↓ + 2KNO₃

Overview

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.

Participants

Role	Substance	Coefficient	State
Reactant	Silver Nitrate AgNO₃	2	(aq)
Product	Potassium Nitrate KNO₃	2	(aq)

Everyday Example

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

Industrial Importance

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

Properties

Type: Precipitation
Reversible: No
Energy: Exothermic
ΔH: -35.0 kJ/mol

Related Reactions

Aluminum Hydroxide Precipitation Barium Carbonate Precipitation Barium Sulfate Precipitation Cadmium Sulfide Precipitation (Yellow) Calcium Carbonate Precipitation Calcium Fluoride Precipitation (Fluorite) Calcium Oxalate Precipitation (Kidney Stones) Calcium Phosphate Precipitation (Bone Mineral) Calcium Sulfate Precipitation (Gypsum) Chromium(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.