9. Calculate the time to deposit 1.27 g of copper at hode when a current of 2 A was passed through the solution of CuS04. Molar mass of Cu = 63.5 g mol-1 1 F = 96500 C mol-1 Answer: 10. a Following reactions occur at hode during the electrolysis of aqueous copper II chloride solution:
Predict the product formed at the negative electrode during the electrolysis of copper chloride solution. Reveal answer. Copper will be produced because copper is less reactive than hydrogen.
The brine for electrolysis is prepared by withdrawing saturated brine from a salt saturator at a concentration of approximately 360 g/l and diluting this to 20–30 g/l. About 3 kg of sodium chloride is required to form 1 kg of chlorine; approximately 50% of the sodium chloride is converted to hypochlorite.
ii. Suggest the solution left after the electrolysis iii. Suggest one common use of the solution left. Solution 8a. oxygen 8b. The gas relights a glowing splint. 8ci. Use INDUSTRIAL ELECTROLYSIS OF BRINE Chlorine gas Hydrogen gas BRINE NaCl solution CATHODE H and Na ANODE OH- and Cl2Cl - 2H 2e- 2e Cl2 - OH- left in solution so concentration grows Sodium chloride solution neutral slowly changed to sodium hydroxide solution alkaline H2 Na left in solution so concentration grows 21. A good example of this is the electrolysis of sodium chlorides. When the chloride concentration is large the chloride ions lose electrons and chlorine gas is released at the electrode but when it is in low concentration the hydroxide ions from the water are preferentially released Answer: During electrolysis of aqueous copper sulphate using copper electrodes the two anions OH –.and S0 4 2-migrate to the anode but none of them get discharged because the copper of the anode dissolves in the solution producing copper ions and electrons. So for example the electrolysis of copper chloride solution produces copper at the negative electrode. However the electrolysis of sodium chloride solution produces hydrogen. 6. Electrolysis of copper II chloride solution. The products of electrolysing copper chloride solution are copper metal and chlorine gas. In the simple electrolysis cell left diagram the graphite carbon electrodes are through a large rubber bung & 39;upwardly& 39; dipped into an solution of dilute copper chloride. 3.25 Explain the formation of the products in the electrolysis using inert electrodes of some electrolytes including: copper chloride solution sodium chloride solution sodium sulfate solution water acidified with sulfuric acid molten lead bromide… Electrolysis of aqueous sodium chloride yields hydrogen and chlorine with aqueous sodium hydroxide remaining in solution. The reason for the difference is that the reduction of Na E = –2.7 v is energetically more difficult than the reduction of water –1.23 v . In Copper is purified by electrolysis. Electricity is passed through solutions containing copper compounds such as copper II sulfate. The anode positive electrode is made from impure copper and Task 4: Electrolysis Variables - Concentration. Open the final scene Concentration. Use the Pause button to pause the model. Add the 1 M copper chloride solution to one beaker. Add the 0.1 M copper chloride solution to the other beaker. Close the switch in both circuits. Unpause the model. Observe what happens for about 30 seconds. Electrolysis of Copper II Sulphate Solution This experiment is designed to demonstrate the different products obtained when the electrolysis of copper II sulfate solution is carried out first with inert graphite electrodes and then with copper electrodes. The use of copper electrodes illustrates how copper is refined industrially. During the electrolysis of copper II sulfate or "CuSO" 4" the deposition of copper can be seen on the hode; at the same time the anode will be dissolved by the process. It is very important to make a distinction between the labelling of the hode in electrolysis and in galvanic cells as most of the time this causes a bit of confusion. The electrolysis of sodium chloride solution using a mercury hode This is a good example of a case where the nature of the electrode makes a huge difference. This was once a major industrial method for manufacturing sodium hydroxide solution as well as chlorine and hydrogen but it has been largely replaced by more environmentally friendly A. Electrolysis of copper II sulphate solution. An electrolytic cell is filled with 0.1 mol dm-3 copper II sulphate CuSO 4 solution until it is half full. The apparatus is set up as shown in Figure. The test tube must be full of the copper II sulphate solution at the beginning of the activity.Electrolysis revision - SlideShare
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