Question

The flocculation value of $\mathrm{HCl}$ for ${\mathrm{As}}_2{\mathrm{S}}_3$sol is$30\mathrm{m}\mathrm{mol}{\mathrm{L}}^{-1}$. It ${\mathrm{H}}_2{\mathrm{SO}}_4$ is used for the flocculation of arsenic sulfide, the amount, in grams, of ${\mathrm{H}}_2{\mathrm{SO}}_4$ in$250\mathrm{mL}$ required for the above purpose is

Answer 1

Flocculation:

• A chemical coagulant added to water promotes particle bonding, resulting in larger, easier-to-separate aggregates.
• The method is commonly used in water treatment plants and can also be used to process monitoring samples.

Flocculation Value:

• An electrolyte's flocculation value is the lowest concentration required to cause a sol to coagulate.
• It's measured in millimoles per liter
• For $250\mathrm{mL}$of a sol, $\left(\frac{15}{4}\right)\times 98\times {10}^{-3}\mathrm{g}$ of ${\mathrm{H}}_2{\mathrm{SO}}_4=0.3675\mathrm{g}$

Hence, the answer is $0.3675\mathrm{g}$