To 40 g of a 10% sodium chloride solution, 12 g of salt was added, how much salt is in the resulting solution in%.

univerkov | September 24, 2021 | education

Find the mass of sodium chloride salt in the original solution:

m1 (NaCl) = mr.-pa1 (NaCl) * w1 (NaCl) / 100 = 40 * 10/100 = 4 (g).

Find the mass of sodium chloride salt in the resulting solution:

m2 (NaCl) = m1 (NaCl) + madd. (NaCl) = 4 + 12 = 16 (g).

Find the mass of the resulting sodium chloride salt solution:

mr.-pa2 (NaCl) = m.-pa1 (NaCl) + madd. (NaCl) = 40 + 12 = 52 (g).

Find the mass fraction of sodium chloride salt in the resulting solution:

w2 (NaCl) = (m2 (NaCl) / mp.-pa2 (NaCl)) * 100 = (16/52) * 100 = 30.77 = 31 (%).

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