Free 2019 WAEC GCE Chemistry Practical Runz/Expo Questions and Answers Aug/Sept
2019 WAEC GCE CHEMISTRY PRACTICAL ANSWERS BY GURUSVOICE CEO [MRCODED]
1a) Given: gram conc. of HCl = 5g/dm³
Using molar conc = gram conc/molar mass
Molar con of acid = 5/36.5 = 0.13998mol/dm³
1b) Using
CAVA/CBVB = nA/nB
0.13698 * 11.3/25 * CB = 1/1
25CB = 0.13698 * 11.3
CB = 0.13698 * 11.3/25
concentration of base, CB = 0.0619mol/dm³
1bi) The indicator uses is methyl orange because the tradition is based on a strong acid and a strong base
1bii) Orange colour at the end point
(3a)
Sucrose + Benedict solution+heat => no colour change
Inference: non reducing sugar present.
Glucose+Benedict solution+heat=> brick red colour formed.
Inference: Reducing sugar like glucose present
(3bi)
(i) potassium iodide
(ii) throsulphate
(3bii)
Starch indicator
(3biii)
(i)before end point - dark color
(ii)at the end point - colourless
(3c)
(i) Soda lime is preferred because it does not attack rubber
(ii) Because soda lime is not deliquescent
2019 WAEC GCE CHEMISTRY PRACTICAL ANSWERS BY GURUSVOICE CEO [MRCODED]
1a) Given: gram conc. of HCl = 5g/dm³
Using molar conc = gram conc/molar mass
Molar con of acid = 5/36.5 = 0.13998mol/dm³
1b) Using
CAVA/CBVB = nA/nB
0.13698 * 11.3/25 * CB = 1/1
25CB = 0.13698 * 11.3
CB = 0.13698 * 11.3/25
concentration of base, CB = 0.0619mol/dm³
1bi) The indicator uses is methyl orange because the tradition is based on a strong acid and a strong base
1bii) Orange colour at the end point
(3a)
Sucrose + Benedict solution+heat => no colour change
Inference: non reducing sugar present.
Glucose+Benedict solution+heat=> brick red colour formed.
Inference: Reducing sugar like glucose present
(3bi)
(i) potassium iodide
(ii) throsulphate
(3bii)
Starch indicator
(3biii)
(i)before end point - dark color
(ii)at the end point - colourless
(3c)
(i) Soda lime is preferred because it does not attack rubber
(ii) Because soda lime is not deliquescent
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This is to inform the general public that WAEC GCE 2019/2020 Chemistry Practical Expo Questions Paper for May/June Exam has been made available.
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