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Question
Give balanced equation to show how temporary hardness enters into water.
Solution
Temporary hardness: Enters in water when rain water containing CO2 falls on earth and combines with limestone [CaCO3] & magnesite [MgCO3] layers forming respective soluble bicarbonates.
\[\ce{CaCO3 + H2O + CO2 -> \underset{\text{Cal. bicarbonate}}{Ca[HCO3]2}}\]
\[\ce{MgCO3 + H2O + CO2 ->\underset{\text{Magnesium bicarbonate}}{Mg[HCO3]2}}\]
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