What mass of salt should be added to 200 ml of water to get a 2% solution?

In this solution, 200 grams of water will have a mass fraction of 98%.

Find the mass of the solution by dividing the mass of water by its mass fraction.

m solution = 200 / 0.98 = 204.1 grams;

Let us find the mass of salt by subtracting the mass of water from the mass of the solution.

m salt = 204.1 – 200 = 4.1 grams;

Checking: 4.1 + 200 = 204.1;