Neco 2024 Chemistry Question 7

Practice essay / theory question 7 from the 2024 Neco Chemistry examination. This question covers Acids and Bases, Weak Acid Equilibria, Acid‑Base Titration, Buffer Solutions, Hydrolysis of Salts .

Neco 2024 Chemistry Essay / Theory

Topics: Acids and Bases Weak Acid Equilibria Acid‑Base Titration Buffer Solutions Hydrolysis of Salts

Question 7 NECO • 2024 • CHEMISTRY • essay

A weak monoprotic acid HA has a dissociation constant Ka = 1.8 \times 10^{-5}. An aqueous solution is prepared by dissolving 0.250 mol dm\^{-3} of HA in 50.0 cm\^{3} of water. The solution is titrated at 25 \degree C with a strong base, NaOH, of concentration 0.200 mol dm\^{-3}. Answer the following:

Question Parts

( a )

Write the net ionic equation for the reaction between HA and OH\^{-}.

( b )

Calculate the pH of the solution at the half‑equivalence point.

( c )

Determine the volume of NaOH required to raise the pH of the solution to 8.00. Give your answer in millilitres (mL) to three significant figures.

( d )

Identify the salt formed at the equivalence point and explain whether the solution after the equivalence point will be acidic, neutral or basic, giving a clear reason.

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About This Question

This is Neco 2024 Chemistry Question 7. It is one of the essay questions from the 2024 Neco Chemistry examination.

The question covers Acids and Bases, Weak Acid Equilibria, Acid‑Base Titration, Buffer Solutions, Hydrolysis of Salts .

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