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The objective of lime-soda softening process is:
  • a)
    to carbonise water
  • b)
    to enhance biochemical reactions
  • c)
    to remove hardness by forming an insoluble precipitate
  • d)
    to add taste to water
Correct answer is option 'C'. Can you explain this answer?
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The objective of lime-soda softening process is:a)to carbonise waterb)...

Objective of Lime-Soda Softening Process:

There are several reasons why the lime-soda softening process is used in water treatment. The main objective of this process is to remove hardness by forming an insoluble precipitate. Below are the key points explaining this objective in more detail:

Removal of Hardness:
- The primary purpose of lime-soda softening is to remove hardness-causing minerals such as calcium and magnesium from water.
- When lime (calcium hydroxide) and soda ash (sodium carbonate) are added to the water, they react with the dissolved minerals to form insoluble precipitates. These precipitates can then be easily separated from the water.

Formation of Insoluble Precipitate:
- The addition of lime and soda ash raises the pH of the water, causing calcium and magnesium ions to react with carbonate ions to form insoluble compounds like calcium carbonate and magnesium hydroxide.
- These insoluble precipitates settle out of the water, effectively removing the hardness and improving the water quality.

Benefits of Softening Water:
- Softening water helps prevent scale buildup in pipes and appliances, prolonging their lifespan and improving efficiency.
- It also improves the lathering ability of soaps and detergents, leading to cleaner dishes, clothes, and surfaces.

In conclusion, the main objective of the lime-soda softening process in water treatment is to remove hardness by forming insoluble precipitates. This helps improve the quality of water for various domestic, industrial, and commercial uses.
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The objective of lime-soda softening process is:a)to carbonise waterb)...
Lime-Soda Water Softening Process:
  • Lime softening (also known as lime buttering, lime-soda treatment, or Clark's process) is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.
  • Soda lime is a process used in water treatment to remove Hardness from water. This process is now obsolete but was very useful for the treatment of large volumes of hard water.
  • The addition of lime (CaO) and soda Na2Co3 to the hard water precipitates calcium as the carbonate, and magnesium as its hydroxide. The amounts of the two chemicals required are easily calculated from the analysis of the water and stoichiometry of the reactions.
  • The lime-soda uses lime, Ca(OH)2, and soda ash, Na2Co3 to precipitate hardness from the solution. Carbon dioxide and carbonate hardness (calcium and Magnesium bicarbonate) are complexed by lime. In this process, Calcium and Magnesium ions are precipitated by the addition of lime (Ca(OH)2) and soda ash Na2Co3
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The objective of lime-soda softening process is:a)to carbonise waterb)to enhance biochemical reactionsc)to remove hardness by forming an insoluble precipitated)to add taste to waterCorrect answer is option 'C'. Can you explain this answer?
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