Gce Model Questions Vol1 2024 Chemistry Question 7

Practice essay / theory question 7 from the 2024 Gce Model Questions Vol1 Chemistry examination. This question covers Acids, Bases, Buffers, Indicators .

Gce Model Questions Vol1 2024 Chemistry Essay / Theory

Topics: Acids Bases Buffers Indicators

Question 7 GCE_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • essay

A buffer solution is prepared by dissolving 0.250 mol of acetic acid (CH₃COOH, Ka = 1.8 × 10⁻⁵) and 0.200 mol of sodium acetate (CH₃COONa) in enough water to give a total volume of 1.00 L.

Question Parts

( a )

Calculate the pH of the buffer solution.

( b )

If 0.050 mol of a strong acid (HCl) is added to the buffer (volume remains 1.00 L), calculate the new pH of the solution.

( c )

Explain, in terms of the acid‑base equilibrium, why the buffer resists a large change in pH when the strong acid is added.

( d )

Suggest a suitable indicator for titrating this buffer with NaOH and justify your choice based on its colour‑change range.

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About This Question

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

The question covers Acids, Bases, Buffers, Indicators .

View More Gce Model Questions Vol1 2024 Chemistry Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

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