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Question
Give a balanced equation for the following conversion:
Calcium sulphate in permanent hard water to calcium carbonate using sodium carbonate.
Solution
\[\ce{\underset{\text{Sodium carbonate}}{Na2CO3} + \underset{\text{In hard water}}{CaSO4} -> \underset{\text{Cal. carbonate}}{CaCO3↓} + \underset{\text{Sodium sulphate}}{Na2SO4}}\]
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