To prepare a 25% solution, you need to take: a) 25 g of salt and 100 g of water, b) 50 g of salt and 200 g of water,

To prepare a 25% solution, you need to take: a) 25 g of salt and 100 g of water, b) 50 g of salt and 200 g of water, c) 50 g of salt and 150 g of water, d) 50 g of salt and 250 g of water

The solution consists of two components. Dissolved substance (salt) and solvent (water).

Let’s calculate the mass fraction of salt in 4 variants.

To do this, divide the mass of salt by the mass of the solution.

The mass of the solution is equal to the mass of salt and water.

A. From substance 1 = 25 / (25 + 100) = 0.20 = 20%;

B. C substance 2 = 50 / (50 + 200) = 0.20 = 20%;

B. C substance 3 = 50 / (50 + 150) = 0.25 = 25%;

C. C substance 4 = 50 / (50 + 250) = 0.167 = 16.7%;

The correct answer is B.