# Calculate the mass fraction of sodium hydroxide and the volume of water required to prepare 400

September 29, 2021 | education

| **Calculate the mass fraction of sodium hydroxide and the volume of water required to prepare 400 grams of an alkali solution with a mass fraction of NaOH of 10%.**

The mass of the alkali solution is 400 grams;

To find the mass of alkali, it is necessary to multiply its mass fraction by the mass of the solution.

m of alkali = 400 x 0.1 = 40 grams;

To find the mass of water, it is necessary to subtract the mass of alkali from the mass of the solution:

m of water = 400 – 40 = 360 grams;

The density of water is 1 gram / cm3. To prepare this solution, measure 360 ml of water.

Check: 360 + 40 = 400;

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.