Question

3% solution of iodine in alcohol is used as antiseptic. what amount of iodine is required to prepare 250 ml of this solution.

• A. 7.5 g
• B. 9 g
• C. 21 g
• D. 15 g

Answer 1

The correct option is A 7.5 g

3 percent solution of iodine in alcohol implies that $3g$ of iodine is present in $100mL$ of the solution

Now, since $100mL$ solution requires $3g$ iodine,

$250mL$ solution will require $\frac{3}{100}\times 250=7.5g$ iodine,