Waec 2018 Chemistry Practical Answers – May/June Expo

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    Use 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
    =======================

    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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