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  4. The solution of sulphuric acid contains 80 % by weight H2SO4. Specific gravity of this solution is 1.71. Its normality is about

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Q. The solution of sulphuric acid contains $80\%$ by weight $H_2SO_4$. Specific gravity of this solution is $1.71$. Its normality is about

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Solution:

$N=\frac{10 \times \text { sp. gr. og the solution } \times \text { wt. } \% \text { of solute } \times \text { Mol. wt }}{\text { Molecular wt. of solute } \times \text { Eq. wt. }}$
$N=\frac{10 \times 1.71 \times 80 \times 98}{98 \times 49}$
$=27.9$