Gce Model Questions Vol1 2021 Chemistry Question 7

Practice essay / theory question 7 from the 2021 Gce Model Questions Vol1 Chemistry examination. This question covers Acids, Bases, Buffers, Equilibrium constants .

Gce Model Questions Vol1 2021 Chemistry Essay / Theory

Topics: Acids Bases Buffers Equilibrium constants

Question 7 GCE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

A student prepares a buffer solution by dissolving 0.20 mol of acetic acid (CH₃COOH) and 0.30 mol of sodium acetate (CH₃COONa) in enough water to make 1.00 L of solution. The acid dissociation constant of acetic acid is Ka = 1.8 × 10⁻⁵ at 25 °C.

Question Parts

( a )

Calculate the initial pH of the buffer solution.

( b )

The student then adds 0.010 mol of HCl to the buffer (the total volume remains 1.00 L). Determine the new pH of the solution after the acid has reacted with the buffer components.

( c )

Explain, in words, why the pH of the solution changes only slightly after the addition of the strong acid, and give a concise definition of buffer capacity.

( d )

Suggest one practical way to increase the buffer capacity of the solution and justify how it works.

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About This Question

This is Gce Model Questions Vol1 2021 Chemistry Question 7. It is one of the essay questions from the 2021 Gce Model Questions Vol1 Chemistry examination.

The question covers Acids, Bases, Buffers, Equilibrium constants .

View More Gce Model Questions Vol1 2021 Chemistry Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

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