RUSTING
AIR + WATER = RUST
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Three Test Tubes, 7 Days
oil
CaCl₂
cotton
Air + Water
Water Only
Air Only
RUST ✔
✗
✗
Day
waqt
Fe₂O₃·xH₂O
rust
Air + Water
both needed
1. Needed for Rusting
Oxygen (air) + Water: both
4Fe + 3O₂ + xH₂O → 2Fe₂O₃·xH₂O
2. Prevention
Paint, oil/grease, galvanizing (Zn)
Tin plating, plastic coating
3. Remember
Salty water
speeds up rusting
MATRIC CHEMISTRY · ENVIRONMENTAL CHEMISTRY · PUNJAB BOARDS
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