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Practice: (answers at the end of the topic) What would the products be when aluminium chloride (which contains Al3+ and Cl- ions) is melted and electrolysed ? Write half equations to show what goes on at each electrode. Explain the following observations: When lead(II) bromide is heated until it melts and an electric current passed through, a silvery coloured liquid is found under the negative electrode (cathode) and a brown gas appears at the positive electrode (anode). Use half equations to support your answer. Electrolysis of solutions of ionic compounds Ionic compounds will often dissolve in water, so the ions are free to move around in the solution. Water also contains ions - both H+ and OH-, as well as molecules of H2O. These ions are also attracted to the electrodes. e.g. When we make a solution of sodium chloride (NaCl), we get: • Na+ ions and Cl- ions in the solution (from the NaCl) • H+ and OH- ions in the solution (from the water) The Na+ and H+ cations are both attracted to the cathode The Cl- and OH- anions are both attracted to the anodePDF Image | Electrolysis is using an electric current
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