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Question

Sodium and magnesium salts make the water hard.


A
True
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B
False
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Solution

The correct option is A True

Hard water

  • The presence of specific dissolved Calcium (Ca) and Magnesium (Mg) salts in water causes water to be hard.
  • These following are the salts that causes hardness in water.
  1. Calcium sulphate (CaSO4)
  2. Magnesium sulphate (MgSO4)
  3. Calcium chloride (CaCl2)
  4. Calcium bicarbonate Ca(HCO3)2
  5. Magnesium bicarbonate Mg(HCO3)2
  6. Magnesium chloride (MgCl2)
  • There are 2 types of hardness of water -
  1. Temporary hardness of water
  2. Permanent hardness of water

Temporary hardness

  • Temporary hardness of water refers to the hardness of water that is induced by the presence of dissolved Calcium and Magnesium bicarbonates in it.
  • It can be removed by boiling.

Permanent hardness

  • Permanent hardness of water refers to the hardness of water that is induced by the presence of dissolved Calcium and Magnesium Chlorides and sulphates in it.
  • Chemicals like washing soda is used to remove permanent hardness of water.

Hence, the given statement is true.


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