2021 WAEC Chemistry Practical Question Answer Specimen

2021 WAEC Chemistry Practical Question Answer Specimen

2021 WAEC Chemistry Practical Question Answer Specimen

1. 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 the examination.

2. In addition to the fittings and reagents normally contained in a chemistry laboratory, the following apparatus and materials will be required by each candidate.

(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 appropriately labelled.

(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.

(e) Spatula.

(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.

(n) watch glass.

(o) bunsen burner/source of heat.

(p) droppers.

(3) Each candidate should be supplied with the following where n is the candidate’s serial number.

a) 150cm³ of a solution of HCL, in a corked flask or bottle, labelled “An”. These should all be the same containing 9.0cm³ of concentrated HCL (about 60%) per dm³ of solution.

(b) 150cm³ of NaOH solution in a corked flask or bottle labelled “Bn”. These should all be the same containing 4.8g of NaOH per dm³ of solution.

(c) one spatula of a uniform mixture of CUSO4 and (NH4)2CO3 in a specimen bottle and corked immediately, and labelled “Cn”. The components of the mixture should be in the ratio 1 : 1 by mass.

(d) One spatula full of crystals of iodine in a specimen bottle labelled “Dn”. This must be the same for all candidates.

4. In all cases, more materials may be issued if required.

5. The actual concentrations of “An” and “Bn” must be stated on the Supervisor’s Report form. The candidates will assume that the concentrations are exactly as stated in the question paper.

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