Education

WAEC Chemistry Practical Questions and Complete Answers 2022

Are you getting ready to sit for the upcoming WAEC Chemistry practical exam? Then you’ve come to the right place to prepare for your practical exams.Information Guide Nigeria

In this article, we’ve provided you with WAEC past questions and answers for chemistry practicals. As you probably know, WAEC usually recycles their questions, especially practical questions, so studying these practical questions and answers can help boost your chances of obtaining a distinction in your WAEC examination.

The WAEC chemistry practical exams is one of the toughest papers to write in the WAEC examinations. That’s why we’ve provided this article to help you achieve success in your exam. Stay focused, and read through this page carefully.

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WAEC 2022 Chemistry Practical Questions and Answers

Below are the past questions and answers for the WAEC chemistry practical examination.

Question 1 (Titration)

TABULATE

  • Final burette readings (cm³); 37.50 | 22.50 | 37.50 | 44.50
  • Initial burette readings(cm³); 0.00 | 0.00 | 0.00 | 0.00
  • Volume f Acid used (cm³); 37.50 | 22.50 | 22.50 | 22.50

Volume of A used = 1st + 2nd + 3rd/3

= 22.50+22.50+22.50/3

Average volume of A used = 22.50cm³.

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Question (1bi)

  • Concentration of A ( CA )?
  • 03g in 500cm³ of solution
  • Volume = 500cm³/1000 = 0.500dm³
  • In g/dm³ = 2.03/0.5 = 4.06g/dm³

To find concentration in mol/dm³

  • Of A in mol/dm³ = Conc. Of A in g/dm³/Molar mass.
  • Of A in mol/dm³ = 4.06/36.5 = 0.1112mol/dm³
  • Molar mass of A (HCL) = 1+35.5 = 36.5g/mol.

Question (1bii)

Question (1biii)

  • Nb= ? Na= 3, Ca= 0.1112mol/dm³, Cb = 0.12mol/dm³ , Va = 22.50cm³, Vb = 50.00cm³.
  • CaVa/CbVb= nA/nB
  • 1112×22.50/0.12×50 = 3/nB
  • nB × 2.502 = 18 nB = 18/2.502 = :. nB = 7.194moles = 7moles(approx.)

Question (1biv)

Question (2a)

  • Test; C + 10cm³ of distilled water + filter.
  • Observation; C dissolves partially to give a light green solution. Blue filtrate and green residue.
  • Inference; C is a mixture of soluble and insoluble salt.JAMB Form

Question (2bi)

  • Test; 2cm³ of filtrate + NaOH in drops in excess.
  • Observation; Blue precipitate remains.
  • Inference; CU²+ is present.

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Question (2bii)

  • Test; 2bi + warm.
  • Observation; a colourless gas with a choking smell that turns moist red litmus blue and forms dense white fumes with hydrogen chloride gas.
  • Inference; NH³ from NH⁴+.Npower Recruitment

Question (2biii)

  • Test; 2cm³ of filtrate + BaCl² + excess HCl.
  • Observation; white precipitate, precipitate remains.
  • Inference; SO²- CO3²- or SO4²- is present, SO4²- confirmed.

Question (2ci)

  • Test; Residue + HNOg.
  • Observations; effervescence of a colourless and odourless gas, which turns like water milky and turns moist blue to litmus red.
  • Inference; CO2 from CO3²-

Question (2cii)

  • Test; 2ci + NH3 in drops in excess
  • Observations; blue precipitate. Precipitate dissolved to give a deep blue solution.
  • Inference; CU2+ present.
  • CU2+ confirmed.WAEC Result

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Question (3ai)

  • The value will increase.

Question (3aii)

  • This occurs as a result of the decrease in the concentration of base due to the added volume of water.

Question (3bi)

  • There will be no visible reaction because copper is less than Zinc in the electrochemical series.

Question (3bii)

  • It absorbs water and becomes sticky because it is hygroscopic.

Question (3biii)

The solution turns pink.

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Question (3c)

  • When NaOH is added to a solution of zn³+, a white precipitate is formed which later dissolve in excess NaOH due to the formation of zinc hydroxide.JAMB Result

NOTE! These are past WAEC chemistry practical questions and answers which are likely to be released in the upcoming WAEC examination. Study and understand the nature of the WAEC practical exams to pass with flying colours

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