How Calcium Hydroxide remove hardness of the water.
Answers
hay mate here is your answer
Removing harness using chemical method involves the use of chemical water softeners. These are of two types: those which lead to precipitation; and those which do not precipitate.
A. Chemical Water Softeners which lead to precipitation - these are chemical substances added to the water to remove dissolved calcium, magnesium or iron(II) salt by forming precipitate or undissolved solids. The precipitate is then removed by filtration.
Examples of these chemicals are:
(i). Calcium hydroxide, Ca(OH)2 - addition of calculated amount of Ca(OH)2 will remove only temporary hardness from water. Ca(OH)2 precipitates the insoluble trioxocarbonate(IV).
Example, Ca(OH)2(s) + Ca(HCO3)2(aq) → 2CaCO3(s) + 2H2O
Note: Ca(OH)2 is slightly soluble; Ca(HCO3)2 is soluble; CaCO3 is insoluble.
Also, notice that excess of Ca(OH)2 could cause hardness
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