The flocculation value of HCl for arsenic sulphide sol. is 30 m `molL^-1`. If `H_2SO_4` is used for the flocculation of arsenic sulphide, the amount, in grams, of `H_2SO_4` in 250 ml required for the above purpose is __________ . (molecular mass of `H_2SO_4 = 98g//mol)`

Explanation

To solve the problem, we need to determine the amount of \( H_2SO_4 \) required to flocculate arsenic sulfide in a 250 mL solution, given that the flocculation value of HCl is 30 m mol/L.

### Step-by-Step Solution:

1. **Understand the Flocculation Value**:
The flocculation value of HCl for arsenic sulfide is given as 30 m mol/L. This means that 30 millimoles of HCl are required to flocculate 1 liter of arsenic sulfide sol.

2. **Convert the Volume from mL to L**:
...