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Activity 3.11 — Ionic Conductivity
NCERT Activity 3.11: Test whether NaCl conducts electricity in solid, aqueous, and molten states.
How To Perform
1
Test Solid NaCl
Place NaCl crystals between electrodes. The ions are locked in place — will current flow?
2
Dissolve in Water
Add NaCl to water and test. Water separates the ions — observe the bulb!
3
Melt the Salt
Heat NaCl to 801°C. Thermal energy frees the ions — does the bulb glow?
4
Classify & Learn
Why does ionic conduction depend on the state? Answer to find out!
⚠️ Safety Notes
- •Molten NaCl is extremely hot (801°C) — never touch the crucible with bare hands.
- •Use heat-resistant gloves and tongs when handling the crucible.
- •Ensure electrodes are properly insulated.