To 150 g of a 30% iodine solution was added 10 g of the substance. Calculate the mass

To 150 g of a 30% iodine solution was added 10 g of the substance. Calculate the mass fraction of the substance in this solution.

Given:

m (solution I) = 150 g;

w% (I) = 30%;

m (I) = 10 g;

To find:

w% (I in the final solution) -?

Solution:

1) Find the mass of iodine in the originally given solution:

m (I) = 150 g * 0.3 = 45 g;

2) Find the mass of the solution after adding a portion of iodine:

m (solution) = 150 g + 10 g = 160 g;

3) Find the mass of iodine after adding:

m (I) = 45 g + 10 g = 55 g;

4) Find the mass fraction of iodine in the resulting solution:

w% (I) = m (I): m (solution) * 100% = 55 g: 160 g * 100% = 34.4%.

Answer: w% (I) = 34.4%.