Question:

The most appropriate chemical required for the removal of hardness in water due to the presence of calcium sulphate or chloride is

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In water treatment, remember that soda ash is particularly effective in treating hardness caused by calcium sulphate and chloride.
Updated On: May 3, 2025
  • Lime
  • Lime and soda ash
  • Soda ash
  • NaCl
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The Correct Option is C

Solution and Explanation

Soda ash (sodium carbonate) is the most appropriate chemical used to remove hardness in water caused by calcium sulphate or chloride. It reacts with calcium ions in water to form calcium carbonate, which precipitates out, reducing water hardness. Lime can also be used, but soda ash is specifically effective for water hardness due to calcium sulphate or chloride.
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