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During Hoope’s process for electrolytic refining of Al, the middle layer is of
- a)pure Al
- b)impure aluminium
- c)cryolite and BaF2
- d)alloys of Al, Ca and Si
Correct answer is option 'C'. Can you explain this answer?
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During Hoope’s process for electrolytic refining of Al, the midd...
In the Hoope’s process the middle layer consists of cryolite and BaF2.
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During Hoope’s process for electrolytic refining of Al, the midd...
Hoopes process for the electrolytic refining of Al
In the Hoopes process for electrolytic refining of aluminum, the middle layer consists of cryolite (Na3AlF6) and BaF2 (barium fluoride). This layer plays a crucial role in the extraction and purification of aluminum.
1. Introduction to the Hoopes process
- The Hoopes process is an electrolytic refining method used to obtain pure aluminum from impure aluminum.
- It involves the electrolysis of a molten mixture of aluminum oxide (Al2O3) dissolved in molten cryolite (Na3AlF6) with the addition of BaF2 as a flux.
2. Molten cryolite and its role
- Cryolite is added to lower the melting point of aluminum oxide, which has a very high melting point of around 2050°C.
- By adding cryolite, the melting point is reduced to a more manageable temperature range of about 950-1000°C.
- This molten mixture acts as the electrolyte for the electrolytic cell.
3. Role of BaF2
- BaF2 (barium fluoride) is added to improve the conductivity of the molten electrolyte.
- It helps in lowering the resistance of the electrolyte, allowing for more efficient electrolysis.
- Additionally, BaF2 helps to stabilize the molten electrolyte and prevent the formation of undesirable components.
4. Function of the middle layer
- The middle layer in the Hoopes process consists of molten cryolite and BaF2.
- It acts as a solvent for the aluminum oxide, which dissolves in the molten cryolite to form Al3+ ions.
- The dissolved Al3+ ions migrate towards the cathode (negative electrode) during electrolysis.
5. Electrolysis and aluminum production
- During electrolysis, aluminum ions (Al3+) are reduced at the cathode, where they gain electrons and form molten aluminum metal.
- The pure aluminum metal collects at the bottom of the electrolytic cell.
- The impurities in the original aluminum, such as iron and silicon, sink to the bottom of the cell and form a layer called the "dross."
6. Conclusion
- The middle layer in the Hoopes process consists of molten cryolite and BaF2, which act as a solvent for aluminum oxide and improve the conductivity of the electrolyte.
- This process allows for the extraction and purification of aluminum through electrolysis, resulting in the production of pure aluminum metal.
In the Hoopes process for electrolytic refining of aluminum, the middle layer consists of cryolite (Na3AlF6) and BaF2 (barium fluoride). This layer plays a crucial role in the extraction and purification of aluminum.
1. Introduction to the Hoopes process
- The Hoopes process is an electrolytic refining method used to obtain pure aluminum from impure aluminum.
- It involves the electrolysis of a molten mixture of aluminum oxide (Al2O3) dissolved in molten cryolite (Na3AlF6) with the addition of BaF2 as a flux.
2. Molten cryolite and its role
- Cryolite is added to lower the melting point of aluminum oxide, which has a very high melting point of around 2050°C.
- By adding cryolite, the melting point is reduced to a more manageable temperature range of about 950-1000°C.
- This molten mixture acts as the electrolyte for the electrolytic cell.
3. Role of BaF2
- BaF2 (barium fluoride) is added to improve the conductivity of the molten electrolyte.
- It helps in lowering the resistance of the electrolyte, allowing for more efficient electrolysis.
- Additionally, BaF2 helps to stabilize the molten electrolyte and prevent the formation of undesirable components.
4. Function of the middle layer
- The middle layer in the Hoopes process consists of molten cryolite and BaF2.
- It acts as a solvent for the aluminum oxide, which dissolves in the molten cryolite to form Al3+ ions.
- The dissolved Al3+ ions migrate towards the cathode (negative electrode) during electrolysis.
5. Electrolysis and aluminum production
- During electrolysis, aluminum ions (Al3+) are reduced at the cathode, where they gain electrons and form molten aluminum metal.
- The pure aluminum metal collects at the bottom of the electrolytic cell.
- The impurities in the original aluminum, such as iron and silicon, sink to the bottom of the cell and form a layer called the "dross."
6. Conclusion
- The middle layer in the Hoopes process consists of molten cryolite and BaF2, which act as a solvent for aluminum oxide and improve the conductivity of the electrolyte.
- This process allows for the extraction and purification of aluminum through electrolysis, resulting in the production of pure aluminum metal.
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During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer?
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During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer?.
During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During Hoope’s process for electrolytic refining of Al, the middle layer is ofa)pure Alb)impure aluminiumc)cryolite and BaF2d)alloys of Al, Ca and SiCorrect answer is option 'C'. Can you explain this answer?.
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