How many grams of water and sodium chloride do you need to take to prepare 70 g with a 12% solution.
| May 14, 2021 | education
Given:
m solution (NaCl) = 70 g
ω (NaCl) = 12%
To find:
m (H2O) -?
m (NaCl) -?
Decision:
1) Calculate the mass of sodium chloride:
m (NaCl) = ω (NaCl) * m solution (NaCl) / 100% = 12% * 70/100% = 8.4 g;
2) Calculate the mass of water:
m (H2O) = m solution (NaCl) – m (NaCl) = 70 – 8.4 = 61.6 g.
Answer: The mass of sodium chloride is 8.4 g; water – 61.6 g.
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