Note on Hard and Soft Water

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Soft water is the one which can produce lather with soap easily. But the hard water cannot produce lather easily as soft water.

The hardness of water is due to the presence of soluble salts of magnesium and calcium. The salts of magnesium such as magnesium bicarbonate (Mg(HCO3)2), magnesium chloride (MgCl2) or the salts of calcium such as calcium bicarbonate (Ca(HCO3)2), calcium sulphate (CaSO4), when dissolved in water, brings hardness in water.

The hardness of water may be temporary or permanent. Permanent hardness is due to the presence of salts such as magnesium chloride (MgCl2), magnesium sulphate (MgSO4), calcium sulphate (CaSO4), and calcium chloride (CaCl2) in water. Temporary hardness is due to the presence of salts such as calcium bicarbonate (Ca(HCO3)2) or magnesium bicarbonate (Mg(HCO3)2). Temporary hardness can be removed easily.

Advantages of Hard Water
  • It contains calcium salt dissolved in it which helps to strengthen the bones and teeth.
  • It is used in beer industries.
  • Water is somewhat tasty due to dissolved salts of calcium and magnesium.
Disadvantages of Hard Water
  • It leads to the consumption of more soap while washing clothes.
  • A bright white cloth becomes dull due to the salts dissolved in water.
  • In industries, due to hard water, the life of boilers decreases. This is due to the calcium salt deposited during boiling.

Drinking water

Water is used for many purposes. The water that contains micro-organisms, contaminated water, should not be used for drinking. Contaminated water carries many diseases such as cholera, typhoid, and many more. To be healthy, we must drink safe and clean water. The drinking water must be boiled. After boiling, the micro-organisms in water gets killed. So, it is advised to everyone to drink boiled water in order to stay from diseases that transmit through water.

  • Hard Water contains calcium salt dissolved in it which helps to strengthen the bones and teeth.
  • In industries, due to hard water, the life of boilers decreases. This is due to the calcium salt deposited during boiling.
  • The drinking water must be boiled.
  • There are various advantages and disadvantages of hardness of water.
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Very Short Questions

Soft water is the water which can produce lather with soap easily.

Hard water is the water which cannot produce lather with soap easily.

The hardness of water is caused due to the presence of soluble salts of magnesium and calcium.

The salts which bring hardness in water are calcium bicarbonate (Ca(HCO3)2), calcium sulphate (CaSO4), magnesium bicarbonate (Mg(HCO3)2), magnesium chloride (MgCl2), etc.

Any two advantages of hard water are:

(i) It contains calcium salt dissolved in it which helps to strengthen the bones and teeth.

(ii) It is used in beer industries.

Any two disadvantages of hard water are:

(i) It leads to the consumption of more soap while washing clothes.

(ii) A bright white cloth becomes dull due to the salts dissolved in water.

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  • Temporary hardness of water is due to 

    FeSO4
    (Ca(HCO3)2)
    FeSO4
    Cacl2
  • The hardeness of water depends upon

    it's behaviour towards skin
    it's behaviour towards acids
    it's behaviour towards cloth
    it's behaviour towards soap
  • Which water can produce lather with soap easily?

    Light water
    Heavy water
    Hard water
    Soft water
  • Heavy water is

    Distilled water
    Water at 40
    D2O
    H2O
  • Which water is makes washing cloth easier?

    Soft water
    Heavy water
    Hard water
    Light water
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