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NECO 2018 Chemistry Practical Answer – June/July Expo

NECO Chemistry Practical Solution Questions and Answer – JUNE/JULY 2018 Expo Runz.



    CLICK HERE FOR THE no.1 IMAGE
    1ai)
    Tabulate
    Titrations|Rough|first(1)|second(2)|third(3)
    Final burette reading-|20.50|14.90|15.00|15.10|
    initial burette reading- |0.00|0.00|0.00|0.00|
    volume of Acide used- |20.5|14.90|15.00|15.10|
    1ai)
    average volume of Acid used
    1st+2nd+3rd/3
    14.90+15.00+15.10/3=45/3=15cm^3
    1aii)
    2HCL(aq)+Na2CO3(aq)---->2NaCl(aq)+H2O(aq)+CO2(aq)

    1bi)
    CA VA/CB VB =NA/NB
    0.1moldm^-3*15cm^3/CB*25cm^3 *2/1
    CB * 25cm^3*2=0.1moldm^-3*15cm^3*1
    CB * 50=1.5
    CB=1.5/50=0.03moldm^-3
    1bii)
    25cm^3---->0.03mole
    1000cm^3---->x
    x=1000*0.03/25=30/25
    x=1.2moldm^-3
    1biii)
    concentration in mold^-3 =Con glm^3 /molar mass
    0.03moldm^-3=x/106
    x=0.03*106
    x=3.18gldm^3



    CLICK HERE FOR THE no.2 IMAGE
    2a)
    Tabulate
    2ai)
    -OBSERVATION-
    i)C dissolves in water
    ii)formation of white precipitate
    iii)White precipitate dissolves in itel

    -INFERENCE-
    i)C is soluble in water
    ii)CO3^-2,SO4^-2,SO3^2- suspected
    iii)CO3^2-,SO3^2-, suspected

    2bi)
    -OBERSVATION-
    i)effervescence occurs with the evolution of a gas
    ii)the solutions turns to pink

    -INFERENCE-
    i)CO3^2-,SO3^2-, suspected
    ii)CO3^2-,Confrimed



    CLICK HERE FOR THE no.3 IMAGE
    3ai)
    Zinc chloride reaction with HaOH form white gelatinous precipitate solution in excess HaOH.
    Ammonium trioxocarbonate(iv) on reaction with HaoH evolves a gas which turns red litmus paper blue and lime water milky.
    Calcium trioxocarbonate(iv) on reaction with HaoH forms white powdery precipitate insoluble in excess HaOH.
    3aii)
    i)liquid substance--> crystallization
    ii)Solid substance--> precipitation

    3bi)
    i)Evaporation takes place at all temperatures, while boiling occurs at a particular temperatur (at boiling point).
    ii)Evaporation takes place from the surface, whereas the entire liquid boils.
    3bii)
    Carbon(iv)oxide does not support combustion

    3ci)
    molar solution is an aqueous solution that contains 1 mole (gram-molecular weight) of solute in 1 liter of the solution.
    3cii)
    Indicator
    3ciii)
    i)methyl orange 
    ii)Phenolphthalein.



    COMPLETED



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