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Distinguish Between Temporary and Permanent Hardness of Water. - Applied Chemistry 1

Distinguish Between

Distinguish between temporary and permanent hardness of water.

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Solution

TEMPORARYOR ALKALiNE HARDNESS. PERMANET OR NON-ALKALINE HARDNESS.

1.Caused by the process of dissolved bicarbonates of calcium, magnesium and other heavy metals and the carbonates of iron. salts responsible for temporary
hardness are Ca(HCO3)2' Mg(HCO3)2.

1.It is due to presence of dissolved chlorides and sulphates of calcium, magnesium, iron and other heavy metals.
2. Temporary Hardness can be removed by boiling water. 2 Permanent Hardness can not be removed by boiling the water.
3. Temporary hardness is called as carbonates or alkaline hardness. 3.It is also known as non-carbonates or non-alkaline
hardness.

4.Boifing: Ca(HCO3)2→CaCO3 + CO2 + H2O.

Mg(HCO3)2→Mg(OH)2+ 2CO2

4.Can be removed by using chemical and not by boifing
e.g. Lime soda method.

CaCl2 + Na2 CO3 → CaCO3 + 2NaCl.

Concept: Hardness of Water
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