The electrolysis of other molten substances
4 marks · NormalThis question is about the electrolysis of molten tin(II) chloride (SnCl2).
Write the balanced ionic half-equation for the reaction at the cathode.
Write the balanced ionic half-equation for the reaction at the anode.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Sn^{2+} + 2e^- \to Sn
(b) 2Cl^- \to Cl_2 + 2e^-
Common mistakes: Not balancing electrons; Incorrect side for electrons
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Half-equation includes ions and electrons for cathode
A1 (a) · 1 mark · Atoms and charges balanced in cathode equation
M2 (b) · 1 mark · Half-equation includes ions and electrons for anode
A2 (b) · 1 mark · Atoms and charges balanced in anode equation
Worked solution
a) At the cathode (reduction):
b) At the anode (oxidation):