An additional 10 g of salt was added to 190g, 10% salt solution. What is the mass fraction of salt in the resulting solution?

Given:

m (salt solution) = 190 g

w% (salt) = 10%

m (salt) = 10 g

To find:

w% (salts in the final solution) -?

Decision:

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

m (salt) = 190 g * 0.1 = 19 g;

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

m (solution) = 190 g + 10 g = 200 g;

3) Find the mass of salt in the solution after adding:

m (salt) = 19 g + 10 g = 29 g;

4) Find the mass fraction of salt in the final solution:

w% (salt) = m (salt): Mr (solution) * 100% = 29 g: 200 g * 100% = 14.5%.

Answer: w% (salt) = 14.5%.