Hardness in temporary water can be removed by boiling, but hardnes
water can be removed by boiling, but hardness in permanent hard water cannot be removed give reason
Answers
Answer:
Permanent hardness is caused by the presence of calcium & magnesium salts in the water that don’t thermally decompose on heating (unlike temporary hardness, which is caused by the presence of calcium bicarbonate - Ca(HCO3)2, which can be decomposed by heating into insoluble CaCO3). CaCl2, MgCl2 and MgSo4 are the main culprits - these need to be removed by ion exchange resin treatment or a water softener such as calcium hydroxide.
The presence of dissolved magnesium and calcium salts causes hardness in water. Permanent hardness is caused due to dissolved calcium or magnesium sulphates which cannot be removed by boiling.
Temporary hardness is caused due to dissolved magnesium or calcium hydrogen carbonates which can be removed by boiling.
Boiling will increase the permanent hardness of water because boiling removes only water (in the form of vapor), while none of its mineral content boils away - it remains in the vessel.
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