2024 WAEC CHEMISTRY: 2024 WAEC CHEMISTRY PRACTICAL ANSWERS (6062)
2024 WAEC CHEMISTRY PRACTICAL ANSWERS Password/Pin/Code is 6062. You can use it to view 2024 Chemistry Answers A day before the exam.
Note: No. 1 posted
VERY IMPORTANT INFORMATION FOR NUMBER 1
PLEASE REMEMBER TO USE YOUR SCHOOL'S AVERAGE TITRE VALUE(AVERAGE VOLUME OF ACID). WE USED 24.32cm³, TRY TO KNOW YOUR SCHOOL'S AVERAGE TITRE VALUE. ASK YOUR CHEMISTRY TEACHER. THEN, ANYWHERE YOU SEE 24.32cm³ IN MY CALCULATION, PUT YOUR SCHOOL'S OWN AND RE-CALCULATE. THIS IS VERY IMPORTANT!!!
FOR TABLE:
MAKE SURE WHEN YOU SUBTRACT YOUR FINAL BURETTE READING FROM INITIAL BURETTE READING, IT WILL GIVE YOU YOUR SCHOOL'S AVERAGE TITRE VALUE.
FOR CALCULATION:
ANYWHERE U SEE ME USE 24.32, REMOVE IT AND USE UR SCHOOL'S TITRE FIGURE WHICH U GOT IN UR TABLE.
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(1)
This is 2024 WAEC CHEMISTRY PRACTICAL ANSWERS No. 1 (V1)
(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
This is 2024 WAEC CHEMISTRY PRACTICAL ANSWERS No. 2 (V1)
(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
This is 2024 WAEC CHEMISTRY PRACTICAL ANSWERS No. 3 (V1)
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