The solution consists of two components. Dissolved substance and solvent.
The weight of the solution is 500 grams.
Let’s calculate the weight of the salt.
To do this, multiply the weight of the solution by the mass fraction of the dissolved salt.
M salt = 500 x 0.25 = 125 grams;
In a similar way, we calculate the weight of the solvent.
M solvent = 500 x 0.75 = 375 grams;
The density of water is 1 gram / cm3. Therefore, you need to measure out 375 ml. water so that the weight in the solution is 375 grams
Checking: M salt + M solvent = M solution = 125 + 375 = 500 grams;
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