(a)[5]
Describe the electrolysis of concentrated hydrochloric acid. In your answer, include: • a labelled diagram of the apparatus used to carry out the electrolysis and to collect the gases • the names of the substances formed at the positive and negative electrodes. positive electrode negative electrode
(b)[2]
Complete the chemical equation for this reaction. $\text{Na}_2\text{CO}_3 + 2\text{HCl} \rightarrow \ldots\ldots\text{NaCl} + \ldots\ldots + \text{CO}_2$
(c)[1]
Explain how this equation shows that carbon dioxide has been reduced.