Moles in a solution, working out an unknown concentration from a titration, and the volume one mole of any gas takes up at room temperature and pressure.
What you will learn
- Calculate concentration, moles or mass with mol/dm³, and convert to g/dm³
- Pick concordant titres, find the mean and calculate an unknown concentration
- Calculate gas volumes at RTP using 24 dm³ per mole
Concentration in mol/dm³
Concentration can be given in moles of solute per dm³ of solution.
concentration (mol/dm³) = moles of solute ÷ volume (dm³)
moles = concentration × volume (dm³)
concentration (g/dm³) = concentration (mol/dm³) × Mr
All boards (Chemistry only, Higher): recall these.
- 0.050 mol of NaOH in 250 cm³ of solution
- 250 cm³ = 0.250 dm³
- concentration = 0.050 ÷ 0.250 = 0.20 mol/dm³
- in g/dm³: 0.20 × 40 = 8.0 g/dm³
The rest of this lesson and its 15 practice questions are locked.
In this lesson
- Concentration in mol/dm³
- Titration calculations
- Volumes of gases
- Try it: Your first mol/dm³
15 practice questions, marked as you go; about 25 minutes in all.
Key terms
Concordant, Any
In this unit: Quantitative chemistry and the mole
Conservation of mass, relative formula mass, percentages and concentrations, the mole, reacting masses, empirical formulae, yield, atom economy, titrations and gas volumes.