Calculate the mass fraction of salt in the solution obtained by adding 20 g of salt to 150 g

Calculate the mass fraction of salt in the solution obtained by adding 20 g of salt to 150 g of the solution with the mass fraction of solute 10%.

1. Let’s calculate the mass of salt in the initial solution:

mout (salt) = wout (salt) * mout (solution) = 0.1 * 150 = 15 g;

2. find the mass of salt after adding the additive:

mtot (salt) = mout (salt) + mdb (salt) = 15 + 20 = 35 g;

3. Determine the mass of the resulting solution:

mpol (solution) = mout (solution) + madd (salt) = 150 + 20 = 170 g;

4.Set the mass fraction of salt in the resulting solution:

wpol (salt) = mtot (salt): mpol (solution) = 35: 170 = 0.2059 or 20.59%.

Answer: 20.59%.