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Author Topic: 2018/2019 WAEC WASSCE CHEMISTRY PRACTICAL Questions And Answer Expo/Runs  (Read 5297 times)

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Offline JEFFREY96

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Real 2018/2019 WAEC WASSCE CHEMISTRY PRACTICAL Real Questions And Answers  Expo Runs Runz

===================
Tuesday, 3rd April, 2018

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)
====================

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    Offline JEFFREY96

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    Pls Use Your School End Point .
    1 a )
    Volume of pepette = 25. 00Cm ^ 2
    Indicator Used = Methyl Orange
    Tabulate
    BURETTE READING | ROUGH | 1 ST| 2 ND | 3 RD |
    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
    1 bi)
    Con in mol/ dm 3 = conc in g / dm ^ 3 / molar mass
    con of B in g / dm ^ 3 = 4 . 80/ 0 . 25 = 19. 2 g / dm ^ 3
    molar mass = Fe + 2 Cl = 56+ 2 ( 35. 5 )=127 g / mol
    conc in mol/ dm ^ 3 = 19. 2 / 127 = 0 . 15mol/ dm ^ 3
    1 bii )
    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
    1 biii)
    mole = con ( mol/ dm ^ 3 ) x vol ( dm ^ 3 )
    = 0 . 15* 20/ 1000
    = 0 . 003 moles
    ======================

    2a)
    -Test = C+NaOH in drop till in excess
    -Observation = Blue PPT insoluble in excess
    -Inference = Cu2+ is present
    2aii)
    -Test = C+NH3 in drop till in excess
    -observation = Pale blue soluble in excess, aqeous ammonia to
    give a deep blue solutions
    -Inference = Cu2+ is present
    2aiii)
    -Test = C+Dil HNO3 + AgNO3 sol
    -Observation = White PPT
    -Inference = Cl is confirmed
    2bi)
    -Test = D+NaOH in drop till excess + heat
    -Observation = Colourless gas evolved with characteristic choking
    smell, turns litimus paper blue
    -Inference = Gas is NH3, NH4 is present
    2c)
    -Test = D+Dil Hcl + Lime
    -Observation = Residue dissolves liberating a colourless gas which
    turns lime water milky
    -Inference = gas is CO2 , CO^2-3 present
    ====================================
    3ia)
    A white precipitate of barium sulphate will be formed by the instant reaction
    between barium chloride and sulphuric acid.
    BaCl 2 + H 2SO 4 = 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+ H 2S
    3c)
    The iron dissolves, releasing hydrogen and making an iron chloride solution:
    Fe + 2HCl → FeCl₂ + H₂
       
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    admin we are still hoping for more of this.

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