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2020 Waec Chemistry Practical
Specimen Questions For all
- Great care should be taken to ensure that the
information given in items 2 and 3 below does not
reach the candidates either directly or indirectly before
- In addition to the fittings and reagents normally
contained in a chemistry laboratory , the following
apparatus and materials will be required by each
(a) one burette of 50cm³ capacity.
(b) one pipette, either 20cm³ or 25cm³. All candidates
at one centre must use pipettes of the same volume.
These should be clean and free from grease.
(c) the usual apparatus for titration.
(d) the usual apparatus and reagents for qualitative
work. Including the following with all reagents
(i) dilute sodium hydroxide solution.
(ii) dilute hydrochloric acid.
(iii) dilute trioxonitrate(v) acid
(iv) silver trioxonitrate(v) solution.
(v) acidified potassium dichromate solution.
(vi) aqueous ammonia.
(vii) lime water.
(viii) red and blue litmus paper.
(ix) dilute tetraoxosulphate(vi) acid.
(f) filtration apparatus.
(g) one beaker
(h) one boiling tube
(i) four test tubes.
(j) Methyl orange as an indicator.
(k) mathematical table/calculator
(l) wash bottle containing distilled/deionized water.
(m) a burning splint
(o) bunsen burner/source of heat
(3) Each candidate should be supplied with the
following where n is the candidate’s serial number.
(a) 150cm³ of a solution of trioxonitrate (v) acid in a
corked flask or bottle, labelled “An”. These should all
be the same containing 10.0cm³ of concentrated
trioxonitrate (v) acid (about 70%) per dm³ of solution.
(b) 150cm³ of NaOH solution in a corked flask or
bottle labelled “Bn”. These should all be the same
containing 4.0g of NAOH per dm³ of solution.
(c) About 15.0cm³ of an organic Compound,
Propan-2-ol in a corked