To 750 g of a salt solution with a mass fraction of a solute of 1. 25%, 50 g of the same salt was added.

To 750 g of a salt solution with a mass fraction of a solute of 1. 25%, 50 g of the same salt was added. What is the mass fraction of salt in the resulting solution?

Let us find the mass of salt in the original solution, knowing that the mass fraction of salt is 1.25%.

m1 (salt) = 750 * 1.25 / 100 = 9.4 g

Another 50 g of salt was added to the solution, the final mass of the salt will be:

m2 (salt) = 50 + 9.4 = 59.4 g

To find the mass fraction of salt in the resulting solution, you need to divide the mass of the salt m2 by the mass of the solution and multiply the resulting value by 100%. It should be noted that due to the addition of salt, the mass of the final solution increased by 50 g.

w% (salt) = m2 (salt) / m (solution) = 59.4 / (750 + 50) * 100% = 7.4%