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# WAEC 2021 Chemistry (Practical) Question and Answer

(1a)
Volume of burrete = 50.00cm³
Volume of pipette = 25.00cm³
Indicator = Methyl orange

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

(1bi)
Concentration of A ( CA )?
2.03g 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
Conc. of A in mol/dm³ = Conc. of A in g/dm³/Molar mass

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

(1bii)
Number of mole of the Acid in average titre
Na = CaVa
= 0.1112 × 22.50
= 2.52moles

(1biii)
Nb= ? Na= 3, Ca= 0.1112mol/dm³, Cb = 0.12mol/dm³ , Va = 22.50cm³, Vb = 25.00cm³

CaVa/CbVb= nA/nB

0.1112×22.50/0.12×25 = 3/nB

nB × 2.502 = 9
nB = 9/2.502 =
nB = 3.597moles

(1biv)
Mole ratio of Acid to base
nA:nB
= 3:3
= 1:1

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(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

(2bi)
Test; 2cm³ of filtrate + NaOH in drops in excess

Observation; Blue precipitate remains

Inference; CU²+ is present

(2bii)
Test; 2bi + warm

Observation; a colourless gas with a chocking smell which turns moist red litmus blue and forms dense white fumes with hydrogen chloride gas

Inference; NH³ from NH⁴+

(2biii)
Test; 2cm³ of filtrate + BaCl² + excess HCl

Observation; white precipitate, precipitate Remains

Inference; SO²- CO3²- or SO4²- is present, SO4²- confirmed

(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-

(2cii)
Test; 2ci + NH3 in drops in excess

Observations; blue precipitate. Precipitate dissolved to give a deep blue solution

Inference; CU2+ present
CU2+ confirmed

===========================================

(3ai)
The value will increase

(3aii)
The occur as a result of the decrease in the concentration of base due to the added volume of water

(3bi)
There will be no visible reaction because copper is less than Zinc in the electrochemical series

(3bii)
It absorb water and become sticky because it is hygroscopic

(3biii)
The solution turns pink

(3c)

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

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The 2021 WAEC Chemistry Practical Solution Expo Questions and Answers have indeed been long expected and much anticipated. While the official body to conduct the 2021 Senior School Certificate Examination which is the West African Examination Council was originally slated for May/June, but due to some reasons best known to the body, it is now scheduled for August/September.

The following is the examination schedule.

Tuesday, 14th September

Chemistry 3 (Practical) (Alternative A) 9:30 am. – 11:30 am. (1stSet)
Chemistry 3 (Practical) (Alternative A) 12:00noon. –2:00pm.(2ndSet)

Chemistry 3 (Alternative D)(Alternative to Practical Work) 9:30am. –11:00am.

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## WAEC 2021 CHEMISTRY PRACTICAL SPECIMEN

APPARATUS AND MATERIALS REQUIRED:

(1) One burrette of 50cm³ capacity

(2) One pipette, either 20cm³ or 25cm³
*All candidates at one centre must use pipettes of the same volume.

(3) The usual apparatus for titration

(4) The usual apparatus and reagents for qualitative work including the following with all reagents appropriately labelled
(i) dilute sodium hydroxide solution
(ii) dilute hydrochloride acid
(iii) dilute trioxonitrate(v) acid
(iv) barium chloride solution
(v) acidified potassium dichromate solution
(vi) aqueous ammonia
(vii) lime water
(viii) red and blue litmus papers
(ix) dilute tetraoxosulphate(vi) acid.

(5) Spatula

(6) Fitration apparatus

(7) One beaker

(8) One boiling tube

(9) Four test tubes

(10) Methyl orange as indicator

(11) Glass rod

(12) Wash bottle containing distilled/deionized water

(13) Burning splint

(14) Watch glass

(15) Bunsen burner/source of heat

(16) Droppers

(17) Mathematical table/calculator.

* Each candidate should be supplied with the following, where n is the candidates serial number.

(a) 150cm³ of a solution of Hcl, in a corked flask or bottle labelled ‘An‘. These should be the same containing 9.0cm³ of concentrated Hcl (about 36%) per day of solution.

(b) 150cm³ of NaOH solution in a corked flask or bottle labelled ‘Bn‘. These changes should all be the same containing 4.8g of NaOH per dm³ of solution.

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How to Get 2021 WAEC Question and Answer Before Exam Start