Explanation Weak acid and its salt HA is used to prepare the buffered solution HA ⇄ H + + A - NaH ⇄ Na + + A - When strong base NaOH is added, the HA reacts with the OH- to form A - . Once strong base NaOH is further added, A- is formed after the reaction of HA with OH- i.e. OH - + HA → A - + H 2 O Therefore, the amount of (HA) acid reduced and the amount of base (A - ) is incremented when strong base added. When strong acid HCl is added, H+ reacts with (A - ) to prepare HA. H + + A - → HA Therefore, the amount of HA isincremented and the amount of base i.e. A- is reduced

8th Edition

ISBN: 9781305581982

Author: Steven S. Zumdahl, Donald J. DeCoste

Publisher: Cengage Learning

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Chapter 8, Problem 2DQ

Interpretation Introduction

Interpretation:

The change in the pH of the buffer solution needs to be determined, if a strong acid HCl or base NaOhH is added to the buffer solution of a weak acid HA and its salt NAH.

Concept Introduction :

A solution that resists changes in pH when acid or alkali is added to it. Buffers classically include a weak acid or alkali together with one of its salts.

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Chapter 8, Problem 1DQ

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Solution Summary: The author describes a buffer solution that resists changes in pH when acid or alkali is added to it.

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