CH-1738
Electrolysis of solutions
Chemistry · Secondary 4 · Hard · Electrolysis of solutions
A student sets up a circuit with a lamp and two graphite electrodes dipped into a beaker of solid potassium iodide. The lamp does not light. Distilled water is added and the solid dissolves; the lamp now lights.
Why does the lamp light after water is added?
Why does the lamp light after water is added?
- Ions are free to move in the solution when potassium iodide dissolves.
- Electrons are free to move in the solid potassium iodide lattice.
- Potassium metal is formed, which conducts electricity.
- Water molecules become charged and carry the current.
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