How many grams of salt should be taken to prepare a 70% solution if 30 ml of water is taken.

In this solution, 30 grams of water will have a mass fraction of 30%.

Determine the weight of the solution. To do this, we divide the mass of water by its mass fraction.

M solution = M water / C water = 30 / 0.3 = 100 grams;

Let’s find the weight of the salt.

To do this, subtract the weight of water from the weight of the solution.

M salt = M solution – M water = 100 – 30 = 70 grams;

Let’s check:

30 + 70 = 100