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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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Explain how water is an amphoteric substance. Write the chemical equation for the autoionization of water. Write the expression for the equilibrium constant. Kw, for this reaction. What values does Kwhave at 25 °C? What are [ H + ] and [ OH - ] in pure water at 25 °C? How does [ H + ] compare to [ OH - ] in an acidic solution? How does [ H + ] compare to [ OH - ] in a basic solution?

Interpretation Introduction

Interpretation:

The amphoteric nature of water is to be explained. The chemical equation for the autoionization of water and the expression for the equilibrium constant, Kw for the given reaction are to be stated. At 25 οC, the values of Kw, H+ and OH are to be determined. The comparison of H+ with OH in an acidic solution and in basic solution is to be stated.

Concept Introduction:

The substances which have ability to accept a proton as well as to donate a proton are known as amphoteric substances. The partially dissociation of a liquid into its ions is known as autoionization reaction.

Explanation

According to Bronsted-Lowry concept, the stronger base (than water) has tendency to accept the proton from the water. In the reaction of ammonia and water, here, water donates a proton to ammonia and acts as an acid. The corresponding chemical reaction is shown below.

NH3(aq)+H2O(l)NH4+(aq)+OH(aq)

Similarly, the stronger acid (than water) has tendency to donate a proton to water. In the reaction of water and hydrochloric acid, the water accepts a proton from hydrochloric acid and acts as a base. The corresponding chemical reaction is shown below.

HCl(aq)+H2OlH3O+(aq)+Cl(aq)

Hence, water is an amphoteric substance.

The chemical equation for the autoionization of water is shown below.

H2O(l)+H2O(l)H3O+(aq)+OH(aq)

The equilibrium constant for the above reaction is as follows:

K=H3O+OHH2O2KH2O2=H3O+OHKW=H3O+OH KW=

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Ch-17 P-1ALQCh-17 P-2ALQCh-17 P-3ALQCh-17 P-4ALQCh-17 P-5ALQCh-17 P-6ALQCh-17 P-7ALQCh-17 P-8ALQCh-17 P-9ALQCh-17 P-10ALQCh-17 P-11ALQCh-17 P-12ALQCh-17 P-13ALQCh-17 P-14ALQCh-17 P-1QAPCh-17 P-2QAPCh-17 P-3QAPCh-17 P-4QAPCh-17 P-5QAPCh-17 P-6QAPCh-17 P-7QAPCh-17 P-8QAPCh-17 P-9QAPCh-17 P-10QAPCh-17 P-11QAPCh-17 P-12QAPCh-17 P-13QAPCh-17 P-14QAPCh-17 P-15QAPCh-17 P-16QAPCh-17 P-17QAPCh-17 P-18QAPCh-17 P-19QAPCh-17 P-20QAPCh-17 P-21QAPCh-17 P-22QAPCh-17 P-23QAPCh-17 P-24QAPCh-17 P-25QAPCh-17 P-26QAPCh-17 P-27QAPCh-17 P-28QAPCh-17 P-29QAPCh-17 P-30QAPCh-17 P-31QAPCh-17 P-32QAPCh-17 P-33QAPCh-17 P-34QAPCh-17 P-35QAPCh-17 P-36QAPCh-17 P-37QAPCh-17 P-38QAPCh-17 P-39QAPCh-17 P-40QAPCh-17 P-41QAPCh-17 P-42QAPCh-17 P-43QAPCh-17 P-44QAPCh-17 P-45QAPCh-17 P-46QAPCh-17 P-47QAPCh-17 P-48QAPCh-17 P-49QAPCh-17 P-50QAPCh-17 P-51QAPCh-17 P-52QAPCh-17 P-53QAPCh-17 P-54QAPCh-17 P-55QAPCh-17 P-56QAPCh-17 P-57QAPCh-17 P-58QAPCh-17 P-59QAPCh-17 P-60QAPCh-17 P-61QAPCh-17 P-62QAPCh-17 P-63QAPCh-17 P-64QAPCh-17 P-65QAPCh-17 P-66QAPCh-17 P-67QAPCh-17 P-68QAPCh-17 P-69QAPCh-17 P-70QAPCh-17 P-71APCh-17 P-72APCh-17 P-73APCh-17 P-74APCh-17 P-75APCh-17 P-76APCh-17 P-77APCh-17 P-78APCh-17 P-79APCh-17 P-80APCh-17 P-81APCh-17 P-82APCh-17 P-83APCh-17 P-84APCh-17 P-85APCh-17 P-86APCh-17 P-87APCh-17 P-88APCh-17 P-89APCh-17 P-90APCh-17 P-91APCh-17 P-92APCh-17 P-93APCh-17 P-94APCh-17 P-95APCh-17 P-96APCh-17 P-97APCh-17 P-98APCh-17 P-99APCh-17 P-100APCh-17 P-101APCh-17 P-102APCh-17 P-103APCh-17 P-104APCh-17 P-105APCh-17 P-106APCh-17 P-107APCh-17 P-108APCh-17 P-109APCh-17 P-110APCh-17 P-111APCh-17 P-112APCh-17 P-113APCh-17 P-114APCh-17 P-115APCh-17 P-116APCh-17 P-117APCh-17 P-118APCh-17 P-119APCh-17 P-120CPCh-17 P-121CPCh-17 P-122CPCh-17 P-123CPCh-17 P-124CPCh-17 P-125CPCh-17 P-126CPCh-17 P-1CRCh-17 P-2CRCh-17 P-3CRCh-17 P-4CRCh-17 P-5CRCh-17 P-6CRCh-17 P-7CRCh-17 P-8CRCh-17 P-9CRCh-17 P-10CRCh-17 P-11CRCh-17 P-12CRCh-17 P-13CRCh-17 P-14CRCh-17 P-15CRCh-17 P-16CRCh-17 P-17CRCh-17 P-18CRCh-17 P-19CRCh-17 P-20CRCh-17 P-21CRCh-17 P-22CRCh-17 P-23CRCh-17 P-24CR

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