Calculate the mass of potassium carbonate (potash) and the volume of water required to prepare 500 g of a solution with a mass fraction of K2CO3 of 5%.
The mass of the solution is 500 grams;
To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.
m salt = 500 x 0.05 = 25 grams;
To find the mass of water, subtract the mass of salt from the mass of the solution:
m of water = 500 – 25 = 475 grams;
The density of water is 1 gram / cm3. To prepare this solution, measure 475 milliliters of water.
Check: 475 + 25 = 500;
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