Question

Calgon is used for the removal of *

2 points

Sodium carbonate

permanent hardness of water

potassium carbonate

none of the above

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Answer 1

Answer:

Sodium carbonate

Explanation:

The addition of Calgon to hard water causes the calcium and magnesium ions of hard water to displace sodium ions from the ions of Calgon this results in the removal of calcium and magnesium ions from hard water in the form of a complex with Calgon.

Answer 2

Calgon is used for the removal of the permanent hardness of the water.

• Calgon is a complex salt called sodium hexametaphosphate.
• It is used to remove the permanent hardness of water caused by the calcium of magnesium ions in water.
• Calgon captures the calcium or magnesium ions in its cavity and make a complex with the ions. Thus, the ions are no longer free and remove the hardness of the water.