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,, 3
CHAPTER – Experimental Chemistry
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Content
1.1 Experimental design
1.2 Methods of purification and analysis
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1.3 Identification of ions and gases
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It is expected that any course in chemistry will be based on experimental work. Teachers are
encouraged to develop appropriate practical work for candidates to facilitate a greater under-
standing of the subject. Candidates should be aware of the hazards and appropriate safety
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precautions to follow when handling the reagents mentioned in this section.
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Learning Outcomes
Candidates Should be Able to
1.1 Experimental design
(a) name appropriate apparatus for the measurement of time, temperature,
mass and volume, including burettes, pipettes, measuring cylinders and gas
syringes
(b) suggest suitable apparatus, given relevant information, for a variety of sim-
ple experiments, including collection of gases and measurement of rates of B
reaction
1.2 Methods of purification and analysis
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(a) describe methods of purification by the use of a suitable solvent, filtration
and crystallisation, distillation and fractional distillation, with particular ref-
erences to the fractional distillation of crude oil, liquid air and mixtures of
liquids
(b) suggest suitable methods of purification, given information about the sub-
stances involved
(c) describe paper chromatography and interpret chromatograms including
comparison with ‘known’ samples and the use of Rf values
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(d) explain the need to use locating agents in the chromatography of colourless
compounds H
(e) deduce from given melting point and boiling point information, the identi-
ties of substances and their purity
(f) explain that the measurement of purity in substances used in everyday life,
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e.g. foodstuffs and drugs, is important
0345-2494359
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