To prepare a solution of aluminum sulfate (Al2 (SO4) 3), 2.4 g of salt and 60 ml of water were taken (p = 1 g / cm3). Determine the mass fraction as a percentage of the dissolved. substances in the resulting solution.
The solution consists of two components. Dissolved substance (aluminum sulfate) and solvent (water).
The density of water is 1 gram / cm3. Therefore, you need to measure out 60 ml. water so that the weight in the solution is 60 grams.
The weight of the solution is 2.4 + 60 = 62.4 grams.
Let’s calculate the mass fraction of salt.
To do this, divide the mass of salt by the mass of the solution.
С substance = 2.4 / 62.4 = 0.038 = 3.8%;
In a similar way, we calculate the mass fraction of the solvent.
From water = 60 / 62.4 = 0.962 = 96.2%;
Checking: C substance + C solvent = 3.8 + 96.2 = 100%;
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