Neco Model Questions Vol1 2018 Chemistry Question 7

Practice essay / theory question 7 from the 2018 Neco Model Questions Vol1 Chemistry examination. This question covers Acids, Bases, Salts, Buffer solutions .

Neco Model Questions Vol1 2018 Chemistry Essay / Theory

Topics: Acids Bases Salts Buffer solutions

Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay

A 0.250 mol sample of a weak monoprotic acid HA (Ka = 1.2 × 10⁻⁵) is dissolved in 1.00 L of water at 25 °C. The solution is then partially neutralised by adding 1.00 M NaOH until the pH becomes 5.00.

Question Parts

( a )

Calculate the concentrations of the undissociated acid HA and its conjugate base A⁻ present in the solution at pH 5.00.

( b )

Determine the volume (in mL) of the 1.00 M NaOH solution that must be added to obtain the pH of part (a).

( c )

Explain why the buffer prepared in part (b) resists a change in pH when a small amount of a strong acid is added, referring to the relevant equilibrium.

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About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 7. It is one of the essay questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

The question covers Acids, Bases, Salts, Buffer solutions .

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