AQA · Chemistry · 8462

GCSE Chemistry: Concentration of solutions

Quantitative chemistry · AQA GCSE Chemistry (8462), specification point 4.3.2.5. Cards are generated from the exam board's own specification for "Concentration of solutions", and every card links back to the page it came from. Specification © AQA — used with attribution.

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  1. What is the concentration of a solution a measure of?

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    The amount (e.g. mass) of solute dissolved in a given volume of solution.

  2. What unit expresses concentration as mass per volume at GCSE?

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    Grams per cubic decimetre, g/dm³.

  3. Concentration in g/dm³ is measured as ? of solute per given volume of solution.

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    mass

  4. How do you calculate the mass of solute in a solution from its concentration (g/dm³)?

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    Mass (g) = concentration (g/dm³) × volume (dm³).

  5. How many cm³ are in 1 dm³?

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    1000 cm³ — so divide a volume in cm³ by 1000 to convert to dm³ before using g/dm³.

  6. What mass of solute is in 250 cm³ of a 40 g/dm³ solution?

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    10 g (0.25 dm³ × 40 g/dm³).

  7. How does dissolving more solute in the same volume affect a solution's concentration?

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    It increases — concentration is directly proportional to the mass of solute for a fixed volume.

  8. How does increasing the volume of solvent affect the concentration of a fixed mass of solute?

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    It decreases — the same mass is spread through a larger volume, so concentration is inversely proportional to volume.

  9. How do you rearrange mass = concentration × volume to find volume?

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    Volume (dm³) = mass (g) ÷ concentration (g/dm³).

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