Question:
The flucculation value of $\mathrm{HCl}$ for arsenic sulphide sol. is $30 \mathrm{~m}$ mole $\mathrm{L}^{-1}$. If $\mathrm{H}_{2} \mathrm{SO}_{4}$ is used for the flocculation of arsenic sulphide, the amount, in grams, of $\mathrm{H}_{2} \mathrm{SO}_{4}$ in $250 \mathrm{ml}$ required for the above purpose is
(molecular mass of $\mathrm{H}_{2} \mathrm{SO}_{4}=98 \mathrm{~g} / \mathrm{mol}$ )
Solution:
