Chemistry Qualitative Analysis Notes (O Level)
Complete 5070 & 0620 Guide
Master cation & anion tests, gas identification, flowcharts, salt analysis & practical tips. 100% syllabus-aligned. Free PDFs + exam questions.
What is Qualitative Analysis in Chemistry? (O Level 5070 / IGCSE 0620)
Qualitative analysis chemistry o level is the identification of unknown substances using simple chemical tests – no weighing, no calculations. It is a core topic in CAIE O Level Chemistry 5070 syllabus and IGCSE Chemistry 0620.
Unlike quantitative analysis (moles, stoichiometry), qualitative tests tell you WHAT is present. You will learn flame tests, precipitation, gas evolution – exactly what appears in Paper 3 (Practical) and ATP.
FREE Supplementary O Level Chemistry PDF Notes (All Chapters)
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Complete Qualitative Analysis Chemistry O Level Notes
Cations (Flame & Precipitation Tests)
| Ion | Test | Observation |
|---|---|---|
| Na⁺ | Flame test | Yellow |
| K⁺ | Flame test | Lilac |
| Ca²⁺ | Flame test | Brick-red |
| Cu²⁺ | Flame test / NH₃ | Blue-green / Deep blue solution |
| Fe²⁺ | NaOH | Green ppt |
| Fe³⁺ | NaOH | Brown ppt |
| NH₄⁺ | NaOH + heat | Ammonia gas (turns red litmus blue) |
Anions
| Ion | Reagent | Observation |
|---|---|---|
| Cl⁻ | AgNO₃ + dil. HNO₃ | White ppt soluble in NH₃ |
| Br⁻ | AgNO₃ + dil. HNO₃ | Cream ppt |
| I⁻ | AgNO₃ + dil. HNO₃ | Yellow ppt |
| SO₄²⁻ | BaCl₂ + dil. HCl | White ppt insoluble |
| CO₃²⁻ | Dil. HCl | CO₂ gas (turns limewater milky) |
Gas Tests – Must Memorise for Paper 3
Qualitative Analysis Flow Chart (O Level)
Unknown salt → Flame test → Add NaOH → Add NH₃ → Acid test → Gas test → Confirm with specific reagents
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Chemistry Cheat Sheet – Cations/Anions/Gases (Qualitative Tests)
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FAQs – Chemistry Qualitative Analysis Notes (O Level)
What is qualitative analysis chemistry o level definition?
Identification of ions and gases using chemical tests without numerical measurement.
Qualitative analysis vs quantitative analysis chemistry?
Qualitative = WHAT is present. Quantitative = HOW MUCH (moles, calculations).
Where can I download qualitative analysis chemistry o level notes pdf?
Right here – plus all chapter PDFs above and full syllabus crash course materials inside the paid course.
How to remember qualitative analysis chemistry flow chart?
Use our free supplementary PDFs + watch the cheat-sheet video above. Students remember 100% after one 8-hour crash course.
Real Student Reviews
“Qualitative analysis section in the crash course saved me in Paper 3. Got A* because of the flowcharts and exact test observations.”
— Ahmed R., Karachi, O Level 5070 2025
“YouTube videos had ads every 3 minutes and wrong syllabus. Cambridge Classroom course is straight to the point – finished entire qualitative analysis in 45 minutes.”
— Sara Khan, Lahore, IGCSE 0620
“Best investment. The P1 Past Papers Session + Qualitative notes helped me jump from C to A in 3 weeks.”
— Zain Malik, Dubai
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