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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. A friend asks the following: “Consider a buffered solution made up of the weak acid HA and its salt NaA. If a strong base like NaOH is added, the HA reacts with the OH- to make A-. Thus, the amount of acid (HA) is decreased, and the amount of base (A-) is increased. Analogously, adding HC1 to the buffered solution forms more of the acid (HA) by reacting with the base (A-). How can we claim that a buffered solution resists changes in the pH of the solution?” How would you explain buffering to your friend’?

Interpretation Introduction

Interpretation:

How a buffered solution resists changes in the pH of the solution should be explained?

Concept Introduction:

A buffered solution is a solution that resists a change in its pH on addition of a strong acid or base. A solution is buffered by the presence of a weak acid HA and its conjugated base A-.

Explanation

In this buffering system HA is the weak acid and A- from NaA acts as the conjugate base. When a strong acid like HCl is added in to pure water it fully dissociates and H+ would accumulate lowering the pH. But in the buffered solution, A- ions which are basic have strong affinity to H+. So those two combine to form HA. So H+ from HCl does not accumulate in the solution lowering the pH.

H++A-HA

When a strong base like NaOH is added, into pure water it fully dissociates and OH- would accumulate increasing the pH

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Ch-16 P-2ALQCh-16 P-3ALQCh-16 P-4ALQCh-16 P-5ALQCh-16 P-6ALQCh-16 P-7ALQCh-16 P-8ALQCh-16 P-9ALQCh-16 P-10ALQCh-16 P-11ALQCh-16 P-12ALQCh-16 P-13ALQCh-16 P-14ALQCh-16 P-15ALQCh-16 P-16ALQCh-16 P-17ALQCh-16 P-1QAPCh-16 P-2QAPCh-16 P-3QAPCh-16 P-4QAPCh-16 P-5QAPCh-16 P-6QAPCh-16 P-7QAPCh-16 P-8QAPCh-16 P-9QAPCh-16 P-10QAPCh-16 P-11QAPCh-16 P-12QAPCh-16 P-13QAPCh-16 P-14QAPCh-16 P-15QAPCh-16 P-16QAPCh-16 P-17QAPCh-16 P-18QAPCh-16 P-19QAPCh-16 P-20QAPCh-16 P-21QAPCh-16 P-22QAPCh-16 P-23QAPCh-16 P-24QAPCh-16 P-25QAPCh-16 P-26QAPCh-16 P-27QAPCh-16 P-28QAPCh-16 P-29QAPCh-16 P-30QAPCh-16 P-31QAPCh-16 P-32QAPCh-16 P-33QAPCh-16 P-34QAPCh-16 P-35QAPCh-16 P-36QAPCh-16 P-37QAPCh-16 P-38QAPCh-16 P-39QAPCh-16 P-40QAPCh-16 P-41QAPCh-16 P-42QAPCh-16 P-43QAPCh-16 P-44QAPCh-16 P-45QAPCh-16 P-46QAPCh-16 P-47QAPCh-16 P-48QAPCh-16 P-49QAPCh-16 P-50QAPCh-16 P-51QAPCh-16 P-52QAPCh-16 P-53QAPCh-16 P-54QAPCh-16 P-55QAPCh-16 P-56QAPCh-16 P-57QAPCh-16 P-58QAPCh-16 P-59QAPCh-16 P-60QAPCh-16 P-61QAPCh-16 P-62QAPCh-16 P-63QAPCh-16 P-64QAPCh-16 P-65APCh-16 P-66APCh-16 P-67APCh-16 P-68APCh-16 P-69APCh-16 P-70APCh-16 P-71APCh-16 P-72APCh-16 P-73APCh-16 P-74APCh-16 P-75APCh-16 P-76APCh-16 P-77APCh-16 P-78APCh-16 P-79APCh-16 P-80APCh-16 P-81APCh-16 P-82APCh-16 P-83APCh-16 P-84APCh-16 P-85APCh-16 P-86APCh-16 P-87APCh-16 P-88APCh-16 P-89APCh-16 P-90APCh-16 P-91APCh-16 P-92APCh-16 P-93APCh-16 P-94APCh-16 P-95APCh-16 P-96APCh-16 P-97APCh-16 P-98APCh-16 P-99APCh-16 P-100APCh-16 P-101APCh-16 P-102APCh-16 P-103APCh-16 P-104APCh-16 P-105APCh-16 P-106CPCh-16 P-107CPCh-16 P-108CP

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