2.6 Quantitative Chemistry
Concentration, titration, solution stoichiometry, gas volumes, atom economy and multistep calculations.
How to study for CCEA GCSE Chemistry
Connect particle models to observations, balance every quantitative relationship, and prepare each prescribed practical from safe method through analysis and evaluation.
Core concepts
Concept 1
Solution amount links concentration and volume, with volume converted into the unit required by the formula.
Exam cue: Convert cubic centimetres to cubic decimetres before using mol per cubic decimetre.
Concept 2
Titration uses an accurate reacting volume and balanced equation to determine an unknown concentration.
Exam cue: Take the reacting mole ratio from the balanced equation after finding known moles.
Concept 3
Atom economy measures desired-product incorporation, while yield measures how much theoretical product is actually obtained.
Exam cue: Label every stage with substance and unit so a multistep calculation remains traceable.
Risk pitfalls and guardrails
Using titre volume without subtracting burette readings correctly.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Applying a one-to-one mole ratio when the equation shows otherwise.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Confusing percentage yield with atom economy.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a particle-level explanation with a vague observation.
Memory anchors
Solution moles
Amount in moles equals concentration multiplied by volume in cubic decimetres.
Volume conversion
One cubic decimetre equals 1000 cubic centimetres.
Titre
The volume delivered from the burette to reach the end-point.
Concordant titres
Closely agreeing valid titres used to calculate a representative mean.
Atom economy
Relative formula mass of desired product divided by total products, times 100.
Titration route
Known moles, equation ratio, unknown moles, then unknown concentration.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is concentration in mol dm⁻³?
How many dm³ are 250 cm³?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”