WAEC Chemistry Practical Solution Questions and Answer – MAY/JUNE 2018 Expo Runz.
Please Use Your School End Point.
Volume of pepette = 25.00Cm^2
Indicator Used = Methyl Orange
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
Con in mol/dm3=conc in g/dm^3/molar mass
con of B in g/dm^3 =4.80/0.25 =19.2g/dm^3
molar mass = Fe+2Cl = 56+2(35.5)=127g/mol
conc in mol/dm^3 =19.2/127 =0.15mol/dm^3
using CAVA/CBVB = NA/NB
mole =con(mol/dm^3)x vol (dm^3)
part of the C dissolves,colourless filtrate salt
C is a mixture of soluble salt
white precipitate formed
Cl is present
colourless gas evolved with characteristic choking smell, turns litimus paper blue
Gas is NH3
Residue dissolves liberating a colourless gas which turns lime water milky
gas is CO2
A white precipitate of barium sulphate will be formed by the instant reaction between barium chloride and sulphuric acid.
BaCl2 + H2SO4 = BaSO4 + 2HCl
Iron sulfide reacts with hydrochloric acid, releasing the malodorous (rotten egg smell) and very toxic gas,hydrogen sulphide. FeS + 2 HCl → FeCl2+ H2S
The iron dissolves, releasing hydrogen and making an iron chloride solution:
Fe + 2HCl → FeCl₂ + H₂
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: WAEC 2018 Chemistry Practical Solution Answer – May/June Expo
: WAEC Chemistry Practical Solution Questions and Answer – MAY/JUNE 2018 Expo Runz. Please Use Your School End Point. ===============...