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WAEC 2018 Chemistry Practical Answers: 2018 Waec Chemistry Practical Questions & Answers

Posted by on March 27, 2018 — Drop A Comment


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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)

GOODLUCK!!!

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