Determine the mass of salt required to prepare a 4% solution, if it is known that 40 grams

Determine the mass of salt required to prepare a 4% solution, if it is known that 40 grams of water were used to prepare the solution.

In this solution, 40 grams of water will have a mass fraction of 96%.

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

M solution = M water / C water = 40 / 0.96 = 41.66 grams;

Let’s calculate 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 = 41.66 – 40 = 1.66 grams;

Let’s check:

1.66 + 40.00 = 41.66;