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Question
Distinguish between alkaline and non alkaline hardness?
Solution
| TEMPORARY OR ALKALINE HARDNESS | PERMANENET 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.lt 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 cannot be removed by boiling the water. |
| 3. Temporary hardness is called as carbonates or alkaline hardness. | 3.!t is also known as non-carbonates or non-alkaline hardness. |
|
4. Boiling: Mg(HCO3)2 → Mg(OH)2 +2CO2. |
4.Can be removed by using chemical and not by boiling e.g. Lime soda method. CaCI2 +Na2CO3 → CaCO3 +2NaCI. |
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