Waec Model Questions Vol1 2024 Chemistry Question 7

Practice essay / theory question 7 from the 2024 Waec Model Questions Vol1 Chemistry examination. This question covers Acids, Bases and Salts .

Waec Model Questions Vol1 2024 Chemistry Essay / Theory
Topic: Acids, Bases and Salts
Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

A 0.200 mol sample of the weak monoprotic acid HA (Ka = 1.8 × 10⁻⁵) is dissolved in 500 mL of water. Afterwards 0.050 mol of its sodium salt NaA is added to the solution. Answer the following questions:

Question Parts

( a )
Calculate the pH of the resulting solution. Show clearly how you obtain the concentrations of HA and A⁻ before using any equation.
( b )
If 0.010 mol of a strong acid (HCl) is added to the above buffer, recalculate the pH of the solution. State the stoichiometric changes that occur before the pH calculation.
( c )
The original buffer solution (before adding HCl) is now neutralised by adding NaOH until the equivalence point is reached. Identify the salt formed and discuss its solubility behaviour in water.

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About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 7. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

The question covers Acids, Bases and Salts .

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