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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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. Water is the most common amphoteric substance, which means that, depending on the circumstances, water can behave either as an acid or as a base. Using HF as an example of an acid and NH3 as an example of a base, write equations for these substances reacting with water, in which water behaves as a base and as an acid, respectively.

Interpretation Introduction

Interpretation:

Using HF as an example of an acid and NH3 as an example of a base, equations for these substances reacting with water, in which water behaves as a base and as acid, respectively should be written.

Concept Introduction:

Water is an amphoteric substance which means it can behave as either as an acid or as a base. We can see this clearly in the ionization of water. A proton from one water molecule is transferred to another water molecule to produce a hydroxide ion and a hydronium ion.

H2O(l) + H2O(l)H3O(aq)+ + OH(aq)-.

Explanation

When a strong acid like HF is added to water, since the affinity of water for proton is higher than F-, water attracts protons added from the acid. According to Bronsted-Lowry model, whichever accepts protons is considered as the base.

HF + H2H3O+ + F-

When a weak base like NH3 is added to water, since ammonia has a higher affinity for protons than water, ammonia attracts protons from water molecules

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