4) Electrodes are placed in three different solutions, J, K and L.
A 6V direct current source is connected to the electrodes.
Any products formed at the electrodes are identified.
The results are given in Figure 12.
(a) Explain which solutions are electrolytes.
(b) Which material is most suitable to make the electrodes for the electrolysis of a
(c) When a solution of sodium sulfate, Na2SO4
, is electrolysed, the products formed at
the electrodes are hydrogen and oxygen.
Explain the formation of the products at the electrodes.
(d) Copper is purified by the electrolysis of copper sulfate solution using an impure
copper anode and a pure copper cathode.
Write the half-equation for the formation of a copper atom from a copper ion.