To a solution of calcium nitrate weighing 80 g with a mass fraction of 4% was added 1.8 g of the same salt. Mass fraction
| May 28, 2020 | Education
To a solution of calcium nitrate weighing 80 g with a mass fraction of 4% was added 1.8 g of the same salt. Mass fraction of salt in the resulting solution is equal to
ω = m (substance) / m (solution) (1)
Find the mass of substance from the first solution: m (substance) = m (solution) * ω
m (substance) = 80g * 0.04 = 3.2g
Find the mass of the substance in the resulting solution
m (substance) = 3.2 + 1.8 = 5g
Find the mass of the solution
m = 80+ 1.8 = 81.8g
Substitute the values in the formula (1)
ω = 0.061 or 6.1%
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