WAEC 2021 Chemistry | Practical

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Question 1 View Details
D is a solution containing of ethanedioic acid. E is sodium hydroxide.
Question Parts
(a)
Put D into the burette and titrate it against or portions of E using phenolphthalein as indicator. Repeat the titration to obtain concordant titre values. Tabulate your results and calculate the average volume of acid used. The equation for the reaction is:
(b)
From your results and the information provided. calculate the:
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Question 2 View Details
K is a solution of an inorganic salt. L is a solution of a trioxonitrate (V) salt. Carry out the following exercises on K and L. Record your observations and identify any gas(es) evolved. State the conclusions you draw from the results of each test.
Question Parts
(a)
(i) To about of K, add in drops and then in excess (ii) To another of K, add followed by in drops and then in excess.
(b)
(i) To about portion of L, add in drops then in excess. (ii) To another portion of L, add about of K; boil the mixture and then allow to cool.
(c)
(i) State two reagents that could be used to identify the anion present in \( \mathbf{L} \). (ii) State what would be observed on addition of the reagents stated in 2(c)(i).
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Question 3 View Details
Question Parts
(a)
(i) What are acid-base indicators? (ii) Name a suitable indicator for titrating a weak acid against a strong base. (iii) Give a reason for your answer in 3(a)(ii).
(b)
Give a reason for each of the following laboratory practices: (i) the first jar of hydrogen gas collected during its preparation is discarded; (ii) why the conical flask is not rinsed with the solution to be put in it during titration.
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