1500 mg of acid was dissolved in 20 ml of water. Determine the mass fraction of acid in the solution.

To determine the mass fraction of acid in a solution, it is required to divide the mass of the acid by the mass of the solution. To find the mass of the solution, it is necessary to convert the volume to mass.

The density of water (reference information) is roughly 1000 g / l. Let’s translate the volume of water into liters:

20 ml = 0.02 l.

Now let’s find the mass of water:

m (H2O) = 0.02 * 1000 = 20 g.

Let’s convert milligrams of acid to grams:

1500 mg = 1.5 g.

Now let’s calculate the mass of the solution:

m (solution) = 1.5 + 20 = 21.5 g.

Knowing the masses of the solution and the solute, we find the mass fraction:

w = 1.5 / 21.5 = 0.07

Answer: the mass fraction of acid in the solution is 0.07.