To 300 g of a 5% salt solution was added 30 g of salt. Calculate the mass fraction of the substance in the solution.
August 15, 2021 | education
| 1. Find the mass of salt in the first solution:
m1 (salt) = m1 (solution) * w1 (salt);
m1 (salt) = 300 * 0.05 = 15 g;
2.when adding salt, the masses characterizing the solution will change:
m2 (salt) = m1 (salt) + m (add salt);
m2 (salt) = = 15 + 30 = 45 g;
m2 (solution) = m1 (solution) + m (add salt);
m2 (solution) = 300 + 30 = 330 g;
3. mass fraction of salt in the resulting solution:
w2 (salt) = m2 (salt): m2 (solution);
w2 (salts) = 45: 330 = 0.1364 or 13.64%.
Answer: 0.1364 or 13.64%.
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