Practical & Qualitative Analysis
Planning, measurement, data handling and qualitative analysis.
Before you begin
Planning, measurement, data handling and qualitative analysis.
Learning goals
- Paper 4 Skills: P, MMO, PDO, ACE
- Planning: Variables, Controls, Risk
- Tables, Graphs, Uncertainty
- Titration Skills and Error Sources
- Qualitative Analysis: Cations (Table)
- Qualitative Analysis: Anions and Gases
- Organic Qualitative Tests: What to Know
- Qualitative Analysis Notes
- Gravimetric analysis
- Gas collection and measurement
- Thermochemistry practical techniques
- Kinetics practical techniques
- Simple organic synthesis and purification
Syllabus statements covered
- follow a detailed set or sequence of instructions and use techniques, apparatus and materials safely and effectively
- make, record and present observations and measurements with due regard for precision and accuracy
- interpret and evaluate observations and experimental data
- identify a problem, devise and plan investigations, select techniques, apparatus and materials
- evaluate methods and techniques and suggest possible improvements.
Lessons
Work through them in order.
- Paper 4 Skills: P, MMO, PDO, ACERecognise what each practical skill area asks of you and which techniques it covers.
- Planning: Variables, Controls, RiskTurn a question into a reproducible, safe method.
- Tables, Graphs, UncertaintyTabulate, graph and process data to a justified precision, with uncertainties.
- Titration Skills and Error SourcesCarry out titrations accurately and predict how each technique error shifts the result.
- Qualitative Analysis: Cations (Table)Identify cations from precipitate colours and whether they dissolve in excess reagent.
- Qualitative Analysis: Anions and GasesTest for anions in the right reagent order and confirm the gases they give off.
- Organic Qualitative Tests: What to KnowInterpret organic test results as evidence for functional groups.
- Qualitative Analysis NotesUse the supplied qualitative-analysis tables to draw conclusions from a sequence of tests.
Practise and check
Recommended nextPractical and Qualitative Analysis topic check
Or choose
Topic reference
This topic prepares you for the Paper 4 practical assessment: planning, measurement, data handling and qualitative analysis. The lessons start with the assessed skills, then planning and data, then titration and qualitative-analysis technique.
Paper 4 is 20% of H2 Chemistry: Planning is 4%, and MMO, PDO and ACE together are 16%.
Be comfortable with:
- Stoichiometry: moles, concentrations, titration calculations and significant figures.
- Reaction Kinetics: rate variables, continuous methods and initial-rate evidence.
- Energetics: thermochemical measurements and heat-loss limitations.
- Transition Elements: complex-ion colours and cation observations.
- Organic Chemistry: functional groups and simple test-tube reactions.
Practical questions combine topics: revise the chemistry that justifies a method, not only the apparatus names.
Quick Reference
| Evidence task | Official skill | What a complete response contains |
|---|---|---|
| design a method | Planning (P) | defined problem, logical procedure, data-use plan, risk and precautions |
| perform and record | Manipulation, measurement and observation (MMO) | appropriate operation, detailed observations, justified precision, anomaly recognition |
| organise results | Presentation of data and observations (PDO) | suitable form, effective processing, decimal places/significant figures |
| interpret and improve | Analysis, conclusions and evaluation (ACE) | evidence-based conclusion, prediction, significant limitation, effect and targeted improvement |
| qualitative analysis | MMO + ACE | reagent/condition → observation → cautious inference |
The technique range includes titration, gravimetry, gas collection, thermochemistry, kinetics, inorganic and organic qualitative analysis, and simple organic synthesis/purification.
Common Exam Traps
- Expanding MMO as “measurements, methods and observations” or PDO as “processing, display and organisation”; use the official 9476 names.
- Naming a controlled variable without stating how it is held constant.
- Suggesting “repeat” as a cure for systematic error.
- Reporting more decimal places or significant figures than the apparatus and raw data justify.
- Drawing point-to-point graph segments instead of a suitable best-fit model.
- Writing an ion or functional group without the observation that supports it.
- Treating every row in the supplied QA notes as a test candidates must carry out.
- Importing this H2 Paper 4 family into H1 8873 or treating H3 9813 as its successor.