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Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)

This chemistry-only higher-tier topic links moles, concentration, mass, volume and titration data using algebraic rearrangement and units.

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90 min

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AQAGCSEChemistryQuantitative chemistry

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12 objective pages available

Concentrations in mol/dm3 and titration calculations12 objectives

(chemistry only) (HT only) State that concentration of a solution can be measured in mol/dm3.
(chemistry only) (HT only) Calculate amount in moles of solute from concentration in mol/dm3 and volume.
(chemistry only) (HT only) Calculate mass in grams of solute from concentration in mol/dm3 and volume.
(chemistry only) (HT only) Calculate concentration in mol/dm3 from amount in moles and volume.
(chemistry only) (HT only) Calculate concentration in mol/dm3 from mass of solute and volume.
(chemistry only) (HT only) Explain how concentration in mol/dm3 is related to mass of solute and volume of solution.
(chemistry only) (HT only) Calculate an unknown concentration when reacting volumes are known and one concentration is known.
(chemistry only) (HT only) Use titration data to determine concentrations of strong acids and alkalis. (AT 1, AT 3, AT 8)
(chemistry only) (HT only) Use ratios, fractions and percentages in titration calculations. (MS 1c)
(chemistry only) (HT only) Rearrange concentration equations. (MS 3b)
(chemistry only) (HT only) Substitute numerical values into algebraic equations using appropriate units. (MS 3c)
(chemistry only) (HT only) Convert volumes between cm3 and dm3 where needed in concentration calculations.

Concentrationmol/dm3MolesMass of Soluteconcentrationmass of solutereacting volumestitrationstrong acidrearrangementalgebraic equationcm3

Understand Concentration Units: Calculate carefully by remember that concentration is measured in mol/dm3, which indicates the amount of solute in moles per volume of solution in cubic decimeters. Link your answer to Concentrations in mol/dm3 and titration calculations in Using concentrations of solutions in mol/dm3 (chemistry only) (HT only), and show formula, substitution, calculation, final answer, and unit where relevant.
Master Concentration Calculations: Calculate carefully by practice calculating moles from concentration and volume using the formula: moles = concentration (mol/dm3) × volume (dm3). Link your answer to Concentrations in mol/dm3 and titration calculations in Using concentrations of solutions in mol/dm3 (chemistry only) (HT only), and show formula, substitution, calculation, final answer, and unit where relevant.

Misunderstanding Concentration Units: Remember that mol/dm3 measures the amount of substance in moles per cubic decimeter, while g/dm3 measures mass in grams per cubic decimeter. Focus on the definition of concentration in terms of moles. Keep the correction anchored to Concentrations in mol/dm3 and titration calculations; check formula, substitution, calculation, final answer, and unit where relevant.
Common Mistake in Moles Calculation: Always convert the volume to dm3 by dividing cm3 value by 1000 before using it in the calculation.

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