Question

Part A What substance is produced at the cathode during the electrolysis of molten calcium bromide, CaBry? Assume standard conditions. Express your answer as a chemical formula. View Available Hint(s) - ALQ ROO?

Answer 1

Part A Molten CaBr, consists of Ca2+ and Br ions. Cathode supports reduction and reduction means gain of electrons, thus Ca2+ will gain 2 electrons and become Ca(s) which gets deposited over the cathode. Ans: Ca(s) Part B Anode supports oxidation which is a process in which electrons are lost. 2 Br ---> Br2 + 2e Thus, at anode Br, liquid is formed. Ans: Bry (1) Part C A mixture of Cabrz (1) and Mgiz (1) has four ions Standard reduction potential Cations Ca? - 2.76 Mg2+ -2.38 Standard oxidation potential Anions Br -1.07 -0.54 At cathode, the cation with less negative reduction potential will be reduced, i.e. Mg2 Ans: Mg(s) Part D The anion with less negative oxidation potential will oxidise first i.e. I Ans: 12 (8)