Question

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which salt is used to remove the permanent hardness of water?​

Answer 1

Answer:

Sodium carbonate

Sodium carbonate softens permanent hard water.

Explanation:

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Answer 2

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Sodium Carbonate is used to remove the permanent hardness of water.

Permanent Hardness of Water:

When the soluble salts of magnesium and calcium are present in the form of chlorides and sulphides in water, we call it permanent hardness because this hardness cannot be removed by boiling.

We can remove this hardness by treating the water with washing soda. Insoluble carbonates are formed when washing soda reacts with the sulphide and chloride salts of magnesium and calcium and thus, hard water is converted to soft water.

How to remove permanent hardness of water?

Gan’s Permutit Method:

In this method, sodium aluminum ortho silicate known as permutit or zeolite is used to remove the permanent hardness of water