OCR A Level Chemistry A
3.1.4
Qualitative
Analysis
Section 3.1.4 covers qualitative analysis on a test-tube scale: identifying carbonate ions with acid, sulfate ions with barium ions, halide ions with silver ions and ammonia, and ammonium ions with warm sodium hydroxide, together with the order in which the tests are carried out on an unknown (PAG 4).
Exam Paper
Paper 1 & 3
H432/01 and H432/03
Specification Points
3.1.4 (a)
2 learning outcomes
Topic Parts
1 page
Revision notes available
Exam Board
OCR A
H432 (2015 onwards)
Revision Notes
Work through 3.1.4 Qualitative Analysis in a structured sequence.
Specification Coverage
3.1.4 Qualitative Analysis – OCR A Level Chemistry A
The following OCR A learning outcomes state what candidates should be able to do. Wording is taken from the OCR A Level Chemistry A (H432) specification.
3.1.4 Qualitative analysis
3.1.4(a)
qualitative analysis of ions on a test-tube scale; processes and techniques needed to identify the following ions in an unknown compound:
i
anions: CO₃²⁻, by reaction with H⁺(aq) forming CO₂(g); SO₄²⁻, by precipitation with Ba²⁺(aq); Cl⁻, Br⁻, I⁻ (see 3.1.3 g)
ii
cation: NH₄⁺, by reaction with warm NaOH(aq) forming NH₃
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