Waec 2018 Chemistry Practical QUESTION AND ANSWERS Free Expo

Chemistry 3 (Practical) (Alternative A)  09:30 a.m. - 11:30 a.m. (1st Set)

Chemistry 3 (Practical) (Alternative A)  12:00 noon - 2:00 p.m. (2nd Set)


+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 50cm capacity;
(b) One pipette, either 20cm or 25cm. 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) Red and blue litmus paper,
(ii) aqueous ammonia,
(iii) dilute hydrochloric acid,
(iv) dilute sodium hydroxide solution,
(v) barium chloride solution,
(vi) dilute trioxonitrate(v) acid,
(vii) silver trioxonitrate(v)solution,
(viii) Lime water
(e) glass rod;
(f) filtration apparatus,
(g) spatula,
(h) two boiling tubes,
(i) four test tubes,
(j) wash bottle containing distilled/deionized water,
(k) mathematical table/calculator.

+Each candidate should be supplied with the following, where n is the candidates serial number.
(a) 150cm of potassium tetraoxomanganate(VII)solution in a corked flask or bottled labelled An. These should all be the same containing 7.7g of KMnO4 per dm of solution.
(b) 150cm of iron(II)chloride solution in a corked flask or bottle labelled Nn. These should all be the same containing 19.1g of FeCl2 per dm of solution.

NB- FeCl2 solution should be freshly prepared.
Each candidate should be provided with 150cm 2M H2SO4.

(c) One spatulaful of copper(II)chloride in a specimen bottle labelled Cn and one spatulaful of ammonia carbonate in a specimen bottle labelled Dn.

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