Select Electrolyte
Predict before you switch on
Cations move to the cathode (–) and are reduced; anions move to the anode (+) and are oxidised. What forms at each electrode?
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⚠️ Safety
- Molten lead bromide needs strong heating — lead compounds are toxic and the melt is very hot; use tongs and a heat-resistant mat, and avoid skin contact.
- Bromine vapour (Br₂) at the anode is toxic and corrosive — work in a fume cupboard and do not inhale.
- Acidulated water uses dilute H₂SO₄ (corrosive) and evolves H₂ + O₂, a mixture that is explosive near a flame — keep flames away.
- Copper sulphate solution is harmful/irritant — wash hands after use; avoid contact with eyes.
- Electrical safety: use low-voltage DC, keep connections dry, and switch off before changing electrodes.
Cathode Reaction
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Anode Reaction
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Observations
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