WAEC GCE 2022 CHEMISTRY PRACTICAL ANSWERS
(3ai)
Phenolphthalein is used in titration of CH3COOH2 with NA0H2
Because the titration involves weak acid against Strong Base.
(3aii) When ZnCO3 is Heated Strongly it gives a yellow colour and when it left for few minutes to cool .
It give white colour
(3bi)First you dissolved the two inside water, the glucose will be dissolved while the starch remain insoluble
(3bii)You will then carried out filtration process to obtain starch as to resedure while the glucose remains as crystalloids in the solution
(3biii)To Obtain the glucose you carried out crystallisation and evaporation then follow by recrystallisation
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