How many grams of iodine and alcohol do you need to take to prepare 500 grams of a 5% solution of iodine tincture?

The mass of the solution is 500 grams;

To find the mass of iodine, it is necessary to multiply its mass fraction by the mass of the solution.

m iodine = 500 x 0.05 = 25 grams;

To find the mass of alcohol, subtract the mass of iodine from the mass of the solution:

m of alcohol = 500 – 25 = 475 grams;

Check: 475 + 25 = 500;