Nelson's Cell | Chapter 7 | 9th Class Chemistry | Lec # 16

Teacher/Instructor: Zulfiqar Ali Gujjar If you have any question/query then ask in comment section. For Full playlists: 👇 https://www.youtube.com/@ChemistryPlu... Subscribe 👇 https://www.youtube.com/chemistryplus... For all subjects MCQs plus:    / @mcqsplus   For latest jobs visit:    / @parhopk   Q: 1: What do you know about brine? Ans: The saturated solution of NaCl is called brine. It is used for manufacturing of caustic soda. Q: 2: Describe construction of Nelson’s Cell? Ans Nelson’s cell consists of a steel tank in which graphite anode is suspended in the centre of U-shaped perforated iron cathode. Brine is present inside iron cathode Q: 3: Describe working of Nelson’s cell. Ans: The aqueous solution of NaCl consists of Na+, Cl-, H+ and OH- ions. When electrolysis takes place chlorine gas is discharged at anode while hydrogen gas is discharged at cathode. The sodium hydroxide solution slowly percolates into a catch basin. Q: 4: Describe electrolysis of Aqueous Solution of Sodium Chloride. Ans: Brine ionizes to its ions 2NaCl 2Na+ + Cl- 2HOH 2H+ +2OH- Oxidation at anode 2Cl- Cl2 + 2e- Reduction at cathode 2H++ 2e- H2 Overall reaction. 2NaCl + 2H2O H2+Cl2+2NaOH 2Na++ 2OH- 2NaOH LONG QUESTION(Exercise Q6) Q: 06: How NaOH is prepared on commercial scale. Discuss its chemistry along with diagram? Ans: NaOH is prepared on commercial scale in Nelson’s cell by the electrolysis of aqueous solution of NaCl called brine. Construction of Nelson’s Cell: Nelson’s cell consists of a steel tank in which graphite anode is suspended in the centre of U-shaped perforated iron cathode. Brine is present inside iron cathode. Working of Nelson’s cell: The aqueous solution of NaCl consists of Na+, Cl-, H+ and OH- ions. When electrolysis takes place chlorine gas is discharged at anode while hydrogen gas is discharged at cathode. The sodium hydroxide solution slowly percolates into a catch basin. Electrolysis of Aqueous Solution of Sodium Chloride: Brine ionizes to ions 2NaCl 2Na+ + Cl- 2HOH 2H+ +2OH- Oxidation at anode 2Cl- Cl2 + 2e- Reduction at cathode 2H++ 2e- H2 Overall reaction. 2NaCl + 2H2O H2+Cl2+2NaOH 2Na++ 2OH- 2NaOH