Check WAEC GCE Chemistry Practical Repeated Questions:….The West African Examinations Council (WAEC) is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries. … In a year, over three million candidates registered for the exams coordinated by WAEC.
A->To dry the gas
B->To detect the type of gas that was dried
B->KMno4/Blue litmus paper
-It is an acid that turns moist blue litmus paper red
-It is colourless and poisonous gas with an irritating smell
The irritating smell
Chlorine gas (Cl2(g))
Inference: SO3^2- suspected
(i) Inference: insoluble salt
(ii) Inference: SO3^2- confirmed
(iii) Inference: Cu2 suspected
-Blue gelatineous precipitate
(ii) Copper (ii) trioxosulphate (iv)
burette reading/cm^3 ___ 1 ____ 2 _____ 3
final reading__________ 39.5 __ 29.80 __ 19.40
initial reading ______ 19.55 __ 10.50 ___ 0.0
volume of E used _____ 19.70 ___ 19.30 __ 19.40
ii) Na2CO3(aq)^2HNO3(aq) — 2NaNO3(aq) + CO2(g) + H2O(c)
average volume of E used = 19.70+19.30+19.40/3
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