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Waec 2018 Chemistry Practical Answers – May/June Expo
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chidusky
chidusky (m)
1 year ago
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[b]Please Make Use Of Your School End Point.


(1a)
Volume of pepette = 25.00Cm^2
Indicator Used = Methyl Orange
Tabulate
BURETTE READING|ROUGH|1ST|2ND|3RD|
Final reading Cm^3|25.00|34.00|29.20|24.10|
Initial Reading Cm^3|0.00|10.00|5.00|0.00|
Volume Of Acid Used In Cm^3|25.00|24.00|24.20|24.10|
Average Volume of Acid used =(24.00+24.20+24.10/3)cm^3
=24.10cm^3

(1bii)
using CAVA/CBVB = NA/NB
CA*11.80/0.15*20=1/5
CA=0.15*20*1/11.80*5
CA=0.05moldm^-3

1biii)
mole =con(mol/dm^3)x vol (dm^3)
=0.15*20/1000
=0.003moles.
=========================

(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
========================

(3i)
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)
The iron dissolves, releasing hydrogen and making an iron chloride solution:
Fe + 2HCl → FeCl₂ + H₂

==========
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[/b]
Yahaya
Yahaya (m)
1 year ago
Nigerian
victor
victor (m)
1 year ago
legit
0B0
0B0 (m)
1 year ago
still wertin to be posted help ooh
hajibabs
hajibabs (m)
1 year ago
still waiting!
macdonald
macdonald (m)
1 year ago
notin yet
Baloexpress
Baloexpress (m)
1 year ago
pls help us ooooh
livingtruth
livingtruth (m)
1 year ago
nice one people
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b
b (m)
1 year ago
tnks alot
OCHANO
OCHANO (m)
1 year ago
TANK 4 MKE MY WK SO EASY
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