WAEC 2018 Chemistry Practical Questions And Answer

WAEC 2018 Chemistry Practical Questions And Answer

The West African Examinations Council is an examination board that conducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries.

 

WAEC 2018 Chemistry Practical Questions And Answer

WAEC 2018 Chemistry Practical Questions And Answer

This web page contains all you need to know about WAEC 2018 Chemistry Practical Questions And Answer.

WAEC 2018 Chemistry Practical Questions And Answer

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)

Chemistry 3( Alternative D) (Alternative to Practical Work) **** – 09:30 a.m. – 11:00 a.m.

NOTE:
Tita means θ

^ means Raise to power

Pie means π

/ (means) division or divide

2 whole no 3/4 means 2¾
* means
multiplication (×)

Sqr root means √

Proportional means

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

1bi)
CAVA/CcVc=2/1
Cc=CAVA/2VC
=0.100*23.75Moldm^-3/2*25.00
=0.0475moldm^-3
amount of A used = 0.100x VA/1000=0.100*23.75/1000 =0.00237
2moles Of A = 1mole of C
0.002375mol of A = 0.002375mol/2
100cm^3 of C contain 0.00237*100mol/2*25 =0
1000cm3ofCcontained0.002375x1000mol
2×25
=0.0475mol
concentration of C in moldm-3 =0.0475moldm-3

1bii)
Molar mass of Bing mol-1:
Molar mass of Na2CO3.yH2O=mass concentration of Bingdm-3
molar concentration of Binmoldm-3
=13.6gdm-3
0.0475moldm-3
=286gmol-1

1biii)
Molar mass of Na2CO3 =[(2×23)+12+(16×3)]=106gmol-1
Mass of anhydrous Na2CO3=106×0.0475gdm-3
=5.035gdm-3
Mass of water=13.6-5.035gdm-3
=8.565gdm-3
Mass of Na2CO3 =Molar mass of Na2CO3
Mass of water y×Molar mass of water
5.035=106
8.565 18y
y =106×8.565
5.035×18
=10
More Typing[Keep Refreshing]

================================

(2)Tabulate
Test
(a)(i)Fn+H2O,then

filter

Observation
White residue and blue
filtrate was observed

Inference
Fn is a mixture of

soluble and insoluble

salts

Test
(ii)Filtrate+NaOH(aq)in

drops,then in excess
Observation
A blue gelatinous
precipitate which is
insoluble in excess
NaOH(aq)was formed

Inference
Cu2+present

Test
(iii)Filtrate+NH3(aq)in

drops,then in excess

Observation
A pale blue gelatinous
precipitate was
formed. The precipitate

dissolves or is soluble

in excess NH3(aq)to give
a deep blue solution

Inference
Cu2+confirmed

Test
(iv)Filtrate+dil.HNO3

+AgNO3(aq)

Observation
No visible reaction
White precipitate

formed

Inference
Cl-present

Test
+NH3(aq)in excess

Observation
Precipitatedissolvedin

excessNH3(aq)

Inference
Cl-confirmed

3i) Lime juice is cacitic in nature and the color of methyl orange in active medium is Red

3ii) Iron(iii)chloride will be reduced to iron(ii) with the yell0w deposit of Sulphur

3iv)Addition of ethanoic acid to k2lo3 results to the liberation of a colourless or odourless gas co2 Which turns lime water milky⁠⁠⁠⁠

2018 WAEC SSCE CHEMISTRY
PRACTICAL EXPO, 2018/2019 WAEC SSCE
CHEMISTRY PRACTICAL EXPO / RUNS, 2018
WAEC SSCE CHEMISTRY QUESTIONS AND
ANSWERS EXPO /RUNS, 2018 WAEC SSCE
CHEMISTRY PRACTICAL QUESTIONS AND
ANSWERS / THEORY EXPO / RUNS

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