Neco 2020 Chemistry Question 7

Practice essay / theory question 7 from the 2020 Neco Chemistry examination. This question covers Acids, Bases, Salts, Buffer Solutions .

Neco 2020 Chemistry Essay / Theory
Topics: Acids Bases Salts Buffer Solutions
Question 7 NECO • 2020 • CHEMISTRY • essay

Amira is preparing a buffer solution using acetic acid (CH3COOH) and its salt sodium acetate (CH3COONa). The acid dissociation constant of acetic acid at 25 °C is Ka = 1.8 × 10⁻⁵.

Question Parts

( a )
Write the balanced molecular equation for the neutralisation of acetic acid with sodium hydroxide and derive the net ionic equation.
( b )
Amira dissolves 0.250 mol of CH3COOH and 0.150 mol of CH3COONa in enough water to make 1.00 L of solution. Calculate the pH of the resulting buffer solution. Show all steps and state any assumptions made.
( c )
She then adds 0.050 mol of HCl to the buffer solution (the volume remains 1.00 L).
( ) Determine the new pH of the solution after the addition of HCl.
( ) Explain, using the concept of buffer capacity, why the pH change is relatively small compared with adding the same amount of HCl to pure water.

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About This Question

This is Neco 2020 Chemistry Question 7. It is one of the essay questions from the 2020 Neco Chemistry examination.

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

View More Neco 2020 Chemistry Questions More Neco Practice Questions Back to Questions

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