Physical Properties Properties of Silver nitrate (AgNO3)
- It is soluble in water.
- Its aqueous solution may decompose on exposure to light.
- Action of Heat
On heating AgNO3 decomposes in two stages
2AgNO3 –723 K→ 2AgNO2 + O2 (Silver nitrite)
AgNO2 — 980 K→ Ag + NO2
- With NaCl
AgNO3 gives white precipitate of AgCl with soluble ionic chlorides.
AgNO3 + NaCl → AgCl↓ + NaNO3
- Silver nitrate is strongly caustic and oxidizing in nature.
- With KBr & KI
AgNO3 gives pale yellow precipitate of AgBr with bromides and yellow AgI with iodides.
AgNO3 + KBr → AgBr + KNO3 (Yellow ppt)
AgNO3 + KI → AgI + KNO3 (Yellow ppt)
- Action with organic compounds
Ammoniacal silver nitrate (Tollen’s reagent) is reduced to silver mirror by compounds like formic acid, formaldehyde or glucose:
2AgNO3 + 2NH4OH → Ag2O + 2NH4NO3 + H2O
Ag2O + HCOOH → 2Ag↓ + H2O + CO2