WAEC 2024 CHEMISTRY PRACT ALT B ANSWER



(1)



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(2)



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(2)


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(3a)
(PICK ANY THREE)
(i) The solution of salt was acid solution
(ii) The reaction was exothermic
(iii) A gas (likely CO2) is produced during the reaction.
(iv) An insoluble substance, which precipitates out of the solution is produced
(v) The salt maybe that of a weak acid or contain a metal ion such as calcium, barium, or lead.

(3b)
(i) PbSO4
(ii) NaHCO3
(iii) NH4Cl, NaHCO3 and Cu(NO3)2
(iv) NaHCO3
(v) NH4Cl

(3c)
(PICK ANY THREE)
(i) Ensure all glassware, such as burettes, pipettes, and flasks, are clean and free from any contaminants.
(ii) Calibrate the burette and pipette before use to ensure accurate measurements.
(iii) Carefully measure the volume of acid and sodium hydroxide solutions to be used in the titration.
(iv) Continuously stir the solution in the flask during the titration to ensure thorough mixing of the reactants.
(v) Perform the titration in good lighting conditions to accurately identify the subtle color change at the end point