WAEC 2025 Chemistry | Practical

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Question 1 View Details
A was prepared by dissolving 0.825 g of HCl in \( 250 \mathrm{~cm}^{3} \) of water. B contains 4.0 g of impure \( \mathrm{NaHCO}^{3} \) per \( 250 \mathrm{~cm}^{3} \) of solution.
Question Parts
(a)
Put A in the burette and titrate it against \( 20.0 \mathrm{~cm}^{3} \) or \( 25 \mathrm{~cm}^{3} \) 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. The equation of the reaction is: \( \begin{array}{l} \mathrm{NaHCO}_{(n)}+\mathrm{HCl}_{(n a)}-\mathrm{NaCl}_{(a m)}+\text{CO}_{2 a s}+\text{H}_{2} \mathrm{O}_{(a)} [H=1.0, C=12.0, O=16.0, \mathrm{Na}=23.0, C l=35.5] \end{array} \)
(b)
From your results and the information provided, calculate the.
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Question 2 View Details
Ic is a mixture of two substances. Perform the following exercises on C.
Question Parts
(a)
Put all of C into a beaker and add about \( 10 \mathrm{~cm}^{3} \) of distilled water and stir. Test the solution with litmus papers.
(b)
Divide the solution into four portions:
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