Determine the mass of sodium carbonate required to prepare 500 ml of a 0.25 M solution.

Determine the required amount of a substance for preparing a solution.

To do this, multiply the volume of the solution by its molar concentration.

In order to prepare such a solution, it is necessary to weigh and dissolve in water 0.5 x 0.25 = 0.125 mol of salt.

Let’s calculate the required weight of salt.

To do this, we multiply the molar mass of the salt by the chemical amount of the substance.

M Na2CO3 = 23 x 2+ 12 + 16 x 3 = 106 grams / mol;

m Na2CO3 = 0.125 x 106 = 13.25 grams;