The electrolysis of molten compounds
2 marks · EasyDuring the electrolysis of molten sodium bromide (), write the half-equation for the reaction at the cathode. State the number of electrons gained by each sodium ion.
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; 1 electron gained per Na^+ ion.
Common mistakes: Na^+ + 2e^- -> Na
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Marking points
M1 · 1 mark · Half-equation at cathode:
A1 · 1 mark · States 1 electron is gained per Na^+ ion.
Worked solution
Each sodium ion (Na^+) gains 1 electron.