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NEET
Exam
NEET
Subject
Chemistry
Chapter
Hydrogen

NEET · Chemistry · Hydrogen

How does washing soda (sodium carbonate) remove permanent hardness...

How does washing soda (sodium carbonate) remove permanent hardness from water?

Options

  1. ABy converting calcium and magnesium ions into sodium ions
  2. BBy forming soluble carbonates with calcium and magnesium ions
  3. CBy evaporating the water and leaving behind the hardness ions
  4. DBy reacting with dissolved gases in the water

Correct answer

B. By forming soluble carbonates with calcium and magnesium ions

Step-by-step solution

Washing soda (sodium carbonate) removes permanent hardness from water by reacting with soluble calcium and magnesium ions to form insoluble carbonates, which can then be precipitated and removed.
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