WAEC 2018 Chemistry Practical Solution Answer – May/June Expo

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*WAEC 2018 CHEMISTRY PRACTICAL ANSWERS*





1)

Tabulate

Burette reading|Final burette reading

(cm^3)|Initial burette reading (cm^3)|

Volume of acid used(cm^3)|

Rough- 24.10,0.00,24.10

First- 23.80, 0.00, 23.80

Second- 23.75, 0.00, 23.70

Third- 23.75, 0.00, 23.75

Average volume of A used = 23.80 + 23.70 + 23.75cm^3/3

=23.75cm^3


2a)

-Observation-

part of the C dissolves,colourless filtrate salt


-Inference-

C is a mixture of soluble salt


2bi)

-observation-

white precipitate formed


-Inference-

Cl is present


2bii)

-Observation-

precipitate dissolves


-Inference-

Cl confirmed


2biii)

-Observation-

colourless gas evolved with characteristic choking smell, turns litimus paper blue


-Inference-

Gas is NH3


2c)

-Observation-

Residue dissolves liberating a colourless gas which turns lime water milky


-Inference-

gas is CO2

CO^2-3 present


3a)A white precipitate of barium sulphate will be formed by the instant reaction between barium chloride and sulphuric acid.


BaCl2 + H2SO4 = BaSO4 + 2HCl




3b)Iron sulfide reacts with hydrochloric acid, releasing the malodorous (rotten egg smell) and very toxic gas,hydrogen sulphide. FeS + 2 HCl → FeCl2+ H2S


3c)When solid iron filings are added to dilute aqueous Hydrochloric acid, Iron (II)chloride or ferrous chloride is formed , with the liberation of Hydrogen gas.


Fe (s) + 2HCl (aq) ……..> FeCl2(aq) + H2 (g)




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