The flocculation value of HCl for arsenic sulphide sol is 30mmol L...

The flocculation value of

HCl

for arsenic sulphide

sol

30mmol{L}^{- 1}

. If

{H}_{2}S{O}_{4}

is used for the flocculation of arsenic sulphide, the amount, in grams, of

{H}_{2}S{O}_{4}

250ml

required for the above purpose is ________
(molecular mass of

{H}_{2}{SO}_{4} = 98g / mol

Correct answer

Step-by-step solution

For $1L$ sol $30mmol$ of $HCl$ is required
$∴$ For $1L$ sol $15mmol$ ${H}_{2}{SO}_{4}$ is required
For $250mL$ of sol $\dfrac{15}{4} \times {10}^{- 3}mmol{H}_{2}{SO}_{4}$

Mass of ${H}_{2}{SO}_{4} = 3 . 75 \times {10}^{- 3} \times 98 = 0.3675g$

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