Silver Iodide Precipitation

AgNO3 + KI → AgI↓ + KNO3

Overview

Silver nitrate reacts with potassium iodide to form a yellow precipitate of silver iodide (Ksp = 8.5 × 10⁻¹⁷). AgI is extremely insoluble and does not dissolve in ammonia, unlike AgCl and AgBr. Its crystal structure is similar to ice, making it an excellent cloud seeding agent.

Participants

Role Substance Coefficient State
Reactant Silver Nitrate AgNO₃ 1 (aq)
Product Potassium Nitrate KNO₃ 1 (aq)

Everyday Example

Cloud seeding aircraft release silver iodide particles to induce rain, exploiting AgI's ice-like crystal structure that nucleates ice crystals.

Industrial Importance

Silver iodide is used in cloud seeding for weather modification, in photography, and as an antiseptic agent.

Properties

Type
Precipitation
Reversible
No
Energy
Exothermic
ΔH
-110.0 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 Iodide Precipitation?
The balanced equation is: AgNO₃ + KI → AgI↓ + KNO₃.
What type of reaction is Silver Iodide Precipitation?
Silver Iodide Precipitation is a precipitation reaction.
Is Silver Iodide Precipitation exothermic or endothermic?
Silver Iodide Precipitation is exothermic (releases energy). The enthalpy change (ΔH) is -110.0 kJ/mol.