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  4. One litre hard water contains 12.00 mg Mg2+. Milliequivalents of washing soda required to remove its hardness is

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Q. One litre hard water contains $12.00\, mg \,Mg^{2+}$. Milliequivalents of washing soda required to remove its hardness is

AIPMTAIPMT 1988Some Basic Concepts of Chemistry

Solution:

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Meq of $Mg ^{+2}=$ Meq of washing soda
$ \frac{ W }{ E } \times 1000= Mg ^{+2} ; EW =\frac{24}{2}=12 $
$ \frac{12 \times 10^{-3}}{12} \times 1000=1 $