Neco Model Questions Vol1 2021 Chemistry Question 7

Practice essay / theory question 7 from the 2021 Neco Model Questions Vol1 Chemistry examination. This question covers Acids, Bases, Salts, Buffer Solutions .

Neco Model Questions Vol1 2021 Chemistry Essay / Theory
Topics: Acids Bases Salts Buffer Solutions
Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

A 0.250 mol sample of a monoprotic weak acid HA (Ka = 1.8 × 10⁻⁵) is dissolved in 1.00 L of water and then partially neutralised with NaOH to give a solution that is 40% neutralised.

Question Parts

( a )
Write the overall neutralisation reaction and state the amounts (in moles) of HA and its conjugate base A⁻ present in the resulting solution.
( b )
Calculate the pH of the solution obtained in part (a). Show all steps, including the determination of concentrations and the equilibrium expression you use.
( c )
The solution is then diluted to a total volume of 2.00 L. Explain qualitatively how the pH will be affected by this dilution and relate your answer to the concept of buffer capacity.
( d )
After dilution, 0.050 mol of HCl is added to the 2.00 L solution. Calculate the new pH, stating any assumptions you make.

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About This Question

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

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

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