Upon evaporation of a sodium solution weighing 160 grams, a dry residue weighing 4 grams was formed.
| March 18, 2021 | education
Upon evaporation of a sodium solution weighing 160 grams, a dry residue weighing 4 grams was formed. What is the mass fraction of sodium nitrate in the solution.
Given: m (solution) = 160 g; m (in-va) = 4 g; Find: w -?
Solution: w = m (in-va) / m (solution) = 4/160 = 0.025 (2.5%).
Answer: 2.5%.
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