Chemical Engineering Exam > Chemical Engineering Questions > __________ is removed from water by lime-soda...
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__________ is removed from water by lime-soda process.
- a)Foul smell and taste
- b)Iron and manganese
- c)Temporary hardness
- d)Permanent hardness
Correct answer is option 'C'. Can you explain this answer?
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__________ is removed from water by lime-soda process.a)Foul smell and...
Lime-soda process for removal of temporary hardness from water
Temporary hardness is caused by the presence of bicarbonates of calcium and magnesium in water, which can be removed by the lime-soda process. The process involves the addition of lime (calcium hydroxide) and soda ash (sodium carbonate) to the water.
The lime reacts with bicarbonate ions to form insoluble calcium carbonate, which precipitates out of the water. The reaction is as follows:
Ca(OH)2 + 2HCO3- → CaCO3↓ + 2H2O + 2OH-
The soda ash reacts with the remaining calcium and magnesium ions to form insoluble carbonates, which also precipitate out of the water. The reaction is as follows:
Na2CO3 + Ca2+ → CaCO3↓ + 2Na+
Na2CO3 + Mg2+ → MgCO3↓ + 2Na+
The precipitates formed are then removed by sedimentation or filtration. The resulting water is free from temporary hardness.
Advantages of lime-soda process
- Effective in removing temporary hardness from water
- Relatively simple process and easy to operate
- Low cost compared to other methods
- Can be used for both small and large-scale applications
Disadvantages of lime-soda process
- Does not remove permanent hardness from water
- High doses of lime and soda ash may lead to the formation of sludge and increase in pH of the water
- Precipitates formed may cause scaling in pipes and equipment
- Chemical handling and storage can be hazardous.
Conclusion
The lime-soda process is an effective and economical method for the removal of temporary hardness from water. However, it is important to consider the potential drawbacks and limitations of the process before implementing it.
Temporary hardness is caused by the presence of bicarbonates of calcium and magnesium in water, which can be removed by the lime-soda process. The process involves the addition of lime (calcium hydroxide) and soda ash (sodium carbonate) to the water.
The lime reacts with bicarbonate ions to form insoluble calcium carbonate, which precipitates out of the water. The reaction is as follows:
Ca(OH)2 + 2HCO3- → CaCO3↓ + 2H2O + 2OH-
The soda ash reacts with the remaining calcium and magnesium ions to form insoluble carbonates, which also precipitate out of the water. The reaction is as follows:
Na2CO3 + Ca2+ → CaCO3↓ + 2Na+
Na2CO3 + Mg2+ → MgCO3↓ + 2Na+
The precipitates formed are then removed by sedimentation or filtration. The resulting water is free from temporary hardness.
Advantages of lime-soda process
- Effective in removing temporary hardness from water
- Relatively simple process and easy to operate
- Low cost compared to other methods
- Can be used for both small and large-scale applications
Disadvantages of lime-soda process
- Does not remove permanent hardness from water
- High doses of lime and soda ash may lead to the formation of sludge and increase in pH of the water
- Precipitates formed may cause scaling in pipes and equipment
- Chemical handling and storage can be hazardous.
Conclusion
The lime-soda process is an effective and economical method for the removal of temporary hardness from water. However, it is important to consider the potential drawbacks and limitations of the process before implementing it.
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__________ is removed from water by lime-soda process.a)Foul smell and...
Temporary hardness in water is dissolved bicarbonates of calcium and magnesium. When lime is added, they are precipited as carbonates.
Ca(OH)2+Ca(HCO3)2→2CaCO3+2H2O
Temporary hardness is measured in terms of ppm of CaCO3.
Ca(OH)2+Ca(HCO3)2→2CaCO3+2H2O
Temporary hardness is measured in terms of ppm of CaCO3.
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__________ is removed from water by lime-soda process.a)Foul smell and tasteb)Iron and manganesec)Temporary hardnessd)Permanent hardnessCorrect answer is option 'C'. Can you explain this answer?
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__________ is removed from water by lime-soda process.a)Foul smell and tasteb)Iron and manganesec)Temporary hardnessd)Permanent hardnessCorrect answer is option 'C'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about __________ is removed from water by lime-soda process.a)Foul smell and tasteb)Iron and manganesec)Temporary hardnessd)Permanent hardnessCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for __________ is removed from water by lime-soda process.a)Foul smell and tasteb)Iron and manganesec)Temporary hardnessd)Permanent hardnessCorrect answer is option 'C'. Can you explain this answer?.
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