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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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. Which of the following combinations would act as buffered solutions?

a. HCl and NaCl

b. CH3COOH and KCH3COO

c. H2S and NaHS

d. H2S and Na2S

Interpretation Introduction

Interpretation:

The combination that acts as a buffered solution should be determined.

Concept Introduction:

A buffer solution can be defined as an aqueous solution which is capable of resisting pH changes upon addition of small amounts of a strong base and a strong acid as well as upon dilution by distilled water (or in general water). The action that corresponds to keep the resistance to any changes on pH is known as “ buffering”. A buffer solution has a distinct definite pH value and hence is valuable in reaction conditions where one needs to maintain the pH value at a constant value. Blood is an example of a natural buffer which usually maintains the pH value around 7.4.

There can be two main kinds of buffer systems depending on the pH values that one needs to achieve in preparation of the buffer solutions. The two main kinds are acidic and basic buffer solutions. In both these kinds of buffer solutions there are two main constituents.

In an acidic buffer a weak acid and its conjugate base are the two main components in the buffer system.

Whereas in a basic buffer solution a weak base and its conjugate acid are the two main components in the buffer system.

In order for a solution to successfully function as a buffer solution it must contain a conjugate acid base pair which involves a weak acid/base.

Explanation

Reason for correct option:

b) In this system CH3 COOH is a weak acid and K + CH3 COO− is the conjugate base of the acetic acid. The pair of CH3 COOH/ CH3 COO− can act as a conjugate acid-base pair as shown by equation (2) and (3) by resisting the changes of pH upon addition of strong acid and bases..Hence, the system can function as a buffer solution as it contains the two essential component which a buffer must have. Equation (1) gives a clear representation on how the salt K + CH3 COO− is completely dissociated to yield CH3 COO− to the medium.

b) H2 S in this system is a weak acid and Na2 S is the conjugate base of H2 S. This pair of H2 S/S2 - can act as conjugate acid base pair as shown by equation (5) and (6) by resisting the changes of pH upon addition of strong acid and bases. Hence, the system can function as a buffer solution as it contains the two essential component which a buffer must have. Equation (4) gives a clear representation on how the salt Na2 S is completely dissociated to yield S2 - to the medium...

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