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Produce 0.4 liters of a 0.2 mol/l NaCl solution in the laboratory with a scale and measuring flask.
Solution: c=n/V=m/M/v –> m =c·V·M = 0.2 mol/l·0.4 l · 58.5 g/mol = 4.68 g
Manufacture: 4.68 g of NaCl is put into a glass and then filled with water up to 0.4 litres.
The answer: it's going to be added 0.4 liters now is not entirely accurate, because this is not (at least) the same amount as filling up to the 0.4 liters mark: NaCl takes a small volume.
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