How to cook 300gr. 20% salt solution in water. It is necessary to describe in stages how to cook.

The mass of the solution is 300 grams;

To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.

m salt = 300 x 0.2 = 60 grams;

To find the mass of water, subtract the mass of salt from the mass of the solution:

m of water = 300 – 60 = 240 grams;

The density of water is 1 gram / cm3. To prepare this solution, you need to measure out 240 milliliters of water.

Check: 240 + 60 = 300;