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c) What process does this half equation represent? Answers: The solution contains Na+ ions, SO42- ions, H+ ions and OH- ions. Hydrogen is produced at one electrode, and oxygen is produced at the other electrode. Explain how these products are formed from the ions during electrolysis, and how you would identify the products. You may include ionic equations in your answer. In solution ions will move when current is passed through. Overall water decomposition from 2H O to 2H + O ......2..................2.........2............................................................................................................... Cu2+(aq) + 2e- A: Oxidation B: Displacement C: Reduction X D: Redox Cu(s) d) Copper sulphate solution is the electrolyte used in this process of electrolysis. Explain how copper sulphate solution conducts electricity. ..................................................................................................................... Anode: Ions (copper ions and sulphate ions) are free to 4 OH- O + 2H 0 + 4e- ....................................2............2................................................................................................ ..................................................................................................................... move in solution, resulting in a flow of charge ..................................................................................................................... ..................................................................................................................... ..................................................................................................................... ................................................................................................................................................ 5. A solution of sodium sulphate is electrolysed. ................................................................................................................................................ Sulphate ions will move to anode ................................................................................................................................................ Hydroxide ions move to anode and are oxidised (lose electrons) to form oxygen. ................................................................................................................................................ Oxygen test – glowing splint relights ................................................................................................................................................ Cathode: ................................................................................................................................................ Sodium ions move to cathode ................................................................................................................................................ Hydrogen ions move to cathode and are reduced (gain electrons) to form hydrogen gas. ................................................................................................................................................ 2H+ + 2e- H2 Hydrogen test – lit splint in gas causes squeaky popPDF Image | How to work with Electrolysis
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