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Question
Q13) One litre hard water contains 12.00mg Mg2+ Milli-equivalents of washing soda required to remove its hardness is ... [ CBSE PMT 1988]




SOLUTION


Mg2+ + Na2CO3 → MgCO3 + 2Na+
Thus 1 g eq of Mg2+ required 1 g eq of washing soda
1g equivalent of Mg2+=12000 mg
Thus 12mg Mg2+ required=1g eq/1000=1 mili eq Na2CO3
Answer: (a)