Neco 2019 Chemistry Question 7

Practice essay / theory question 7 from the 2019 Neco Chemistry examination. This question covers Acids Bases and Salts .

Neco 2019 Chemistry Essay / Theory

Topic: Acids Bases and Salts

Question 7 NECO • 2019 • CHEMISTRY • essay

A weak monoprotic acid, HA, is titrated with 0.100 M NaOH. The initial volume of the acid solution is 50.0 mL and its concentration is 0.100 M. At the half‑equivalence point the measured pH is 4.75. At the equivalence point the measured pH is 8.20. Using this information, answer the following:

( a )

Determine the acid dissociation constant (K_a) of HA.

( b )

Calculate the base dissociation constant (K_b) of the conjugate base A⁻.

( c )

Using the data above, calculate the pH of the solution at the equivalence point.

( d )

A 0.10 M aqueous solution of the salt NaA is prepared. Predict its pH and compare it qualitatively with the pH obtained at the equivalence point.

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This is Neco 2019 Chemistry Question 7. It is one of the essay questions from the 2019 Neco Chemistry examination.

The question covers Acids Bases and Salts .

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