AQA · Chemistry · 8462
GCSE Chemistry (AQA): Concentration Calculations (grams/dm^3)
Topic 3 — Quantitative Chemistry. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Concentration Calculations (grams per dm³) (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 3.08 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_3.08.
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How do you calculate the mass of solute from concentration and volume?
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Mass = concentration × volume.
How many cm³ are in 1 dm³?
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1000 cm³ — the same volume as 1 litre.
What is the concentration of 24 g of copper sulfate in 480 cm³ of solution?
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50 g/dm³ — convert 480 cm³ to 0.48 dm³, then 24 ÷ 0.48 = 50.
In the unit g dm⁻³, the negative index means ? dm³.
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What mass of hydrogen chloride is in 400 cm³ of hydrochloric acid of concentration 20 g/dm³?
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8 g — 400 cm³ = 0.4 dm³, and 0.4 × 20 = 8.
How do you convert a volume in cm³ into dm³?
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Divide by 1000 (e.g. 480 cm³ = 0.48 dm³).
What is the equation for the concentration of a solution in g/dm³?
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Concentration = mass ÷ volume (mass in g, volume in dm³).
Why must you check the units given in a concentration question?
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Values are often given in kg or cm³ instead of g and dm³, so they must be converted first — a common exam trap.
How do you calculate the volume of a solution from mass and concentration?
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Volume = mass ÷ concentration.
What is the concentration of 40 g of sodium hydroxide dissolved in 2.5 dm³?
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16 g/dm³, since 40 ÷ 2.5 = 16.
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