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Uses of Calcium Carbonate

Calcium bicar...

Question

Calcium bicarbonate causes hardness in water but not calcium carbonate. Why?

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Solution

Calcium carbonate is insoluble in water so it does not cause hardness whereas calcium bicarbonate is readily soluble in water and causes the hardness of the water by dissolving $C a^{2 +}$ ions in it.

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Q. Calcium bicarbonate in water makes it permanently hard.

Q. Consider the following statements:
Hard water does not give lather with soap because hard water contains:
(a) calcium bicarbonate
(b) magnesium bicarbonate
(c) chlorides of calcium and magnesium
(d) sulphates of calcium and magnesium
Which of these statements are correct?

Q. The temporary hardness of water due to calcium bicarbonate can be removed by:

Permanent hardness is caused by the dissolved __(sulphates/bicarbonates) of calcium and magnesium.

Q. The temporary hardness of water due to calcium bicarbonate can be removed by adding:

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Uses of Calcium Carbonate

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