Topics / Calculations
Mass from concentration Calculate the mass of solute, concentration or solution volume.
The chemistry A mass concentration in g/dm³ tells you the mass of solute in one cubic decimetre of solution.
Use mass = concentration × volume, with volume in dm³. Rearrange to find concentration or volume when needed. There are 1000 cm³ in 1 dm³.
The solution volume is the final volume after dissolving. It is not necessarily the volume of water used.
Worked example A solution contains 12 g/dm³ of sodium chloride. Find the mass in 250 cm³.
250 ÷ 1000 = 0.250 dm³. Mass = 12 × 0.250 = 3.00 g.
Specification references AQA 4.3.2.5; Edexcel 1.49 with equation rearrangement
Mass per volume, not molar concentration.
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The volume is the final volume of solution, not the volume of solvent added.
A sodium chloride solution has a concentration of 16 g/dm³. What mass of sodium chloride is in 150 cm³ of this solution? Give your answer to 2 decimal places.
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