40 g of water was evaporated from 260 g of a 4% solution of baking soda. Find the mass fraction of soda in the resulting solution.

univerkov | December 3, 2020 | education

m (NaHCO3) = 260 * 0.04 = 10.4 g
m (solution) after evaporation = 260-40 = 220 g
W (NaHCO3) = m (NaHCO3) \ m (solution) = 10.4 \ 220 = 4.72%
Answer: 4.72%

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