WAEC 2023 Chemistry | Practical

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Question 1 View Details
A is \( 0.100 \mathrm{~mol} \mathrm{dm}^{-3} \) of HCl. B is \( 0.030 \mathrm{mol} \mathrm{dm}^{-3} \) of a trioxocarbonate (IV) salt.
Question Parts
(a)
Put A into the burette and titrate it with \( 20.0 \mathrm{~cm}^{3} \) or \( 25.0 \mathrm{~cm}^{3} \) portion of B using methyl orange as indicator. Repeat the titration to obtain concordant titre values. Tabulate your results and calculate the average volume of A used.
(b)
From your results and the information provided, calculate the mole ratio of the acid to the trioxocarbonate (IV) in the reaction.
(c)
Given that \( B \) contains \( 5.0 \mathrm{~g} \mathrm{dm}^{-3} \) of the hydrated trioxocarbonate (IV) salt, calculate the:
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Question 2 View Details
C is an organic compound. D is an inorganic compound. Carry out the following exercises on C and D.
Question Parts
(a)
Put C into a test tube and add about \( 5 \mathrm{~cm}^{3} \) of distilled water and shake well. Divide the resulting solution into two portions.
(b)
Divide D into two portions.
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Question 3 View Details
Question Parts
(a)
State what would be observed if few drops of NaOH solution is added to \( 2 \mathrm{~cm}^{3} \) of solutions of each of the following salts:
(b)
Describe briefly how the melting point of benzoic acid could be determined in the laboratory.
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