types of hardness in water.
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1. Temporary hard water
2. Permanent hard water
TEMPORARY HARD WATER
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"Water that contains bicarbonate of calcium and magnesium or of both is called temporary hard water." These bicarbonate are soluble in water and produce corresponding ions.
Mg(HCO3)2 è Mg+2 +2HCO3-1
Ca(HCO3)2 è Ca+2 + 2HCO3-1
PERMANENT HARD WATER
Water that contains chlorides or sulphates of calcium or magnesium or of both is called Permanent water.
CaCl2è Ca+2 + 2Cl-1
MgSO4 è Mg+2 + SO4-2
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1 . temporary and permanent..