Question

211.
If water has magnesium sulphate dissolved in it, for testing its cleaning action, it is to be considered
as :
(a) permanent hard water
(b) hard water
() soft water
(d) temporary hard water​

Answer 1

If water has magnesium sulphate dissolved in it, for testing its cleaning action, it is to be considered as hard water.

* Hard water is referred to a water that has high concentrations of calcium and magnesium salts dissolved in it.

This causes difficulty in lathering of soaps.

* Soft water has lower concentrations of these salts and thereby easily forms lather with soap.

* Temporary hard water and permanent hard water can be differentiated as:

Permanent hardness- presence of calcium sulfate in water which cannot be removed by boiling.

Temporary hardness- presence of calcium hydrogencarbonate which can be removed easily by boiling.

Answer 2

If water has magnesium sulphate dissolved in it, for testing its cleaning action, it is to be considered as (a) permanent hard water (b) hard water.  

Explanation:

• Hard water are those which forms scum when soap is added to it. Hard water is not suitable for using in cleaning purposes.  

• The presence of hardness in water is due to the presence of dissolved salts of magnesium and calcium present in it.  

• Hardness can be temporary as well as permanent. When Magnesium and calcium sulphate are present in water, we say it is a permanent type of hardness.  

• Hence the hardness cannot be removed by boiling of water.

Learn more about magnesium sulphate

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