(a(i))[1]
As electrolysis takes place, gas is formed at both electrodes. Finish the diagram to show the method used to collect the gases.
(a(ii))[1]
State the term used for the negative electrode.
(a(iii))[2]
Predict the main products formed at the negative electrode and the positive electrode during electrolysis of concentrated aqueous sodium chloride.
(a(iv))[1]
Give the name of a suitable element for use as the electrodes in this electrolysis.
(b(i))[1]
What mass of sodium hydroxide is contained in 200 cm$^3$ of this solution?
(b(ii))[1]
What change would impurities cause in the melting point of sodium hydroxide?
(c)[1]
Describe how you could make a sample of solid sodium chloride from sodium chloride solution.