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;
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