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What is the main purpose of adding lime in Clark's method for removing temporary hardness?

Options

  1. ATo increase the temperature of water
  2. BTo improve the taste of water
  3. CTo precipitate calcium carbonate and magnesium hydroxide
  4. DTo enhance the color of water

Correct answer

C. To precipitate calcium carbonate and magnesium hydroxide

Step-by-step solution

In Clark's method, lime is added to hard water to precipitate calcium carbonate and magnesium hydroxide, which can be filtered off to remove temporary hardness.

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