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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

Anions containing hydrogen (for example, HCO3 and H2PO4) usually show amphoteric behavior. Write equations illustrating the amphoterism of these two anions.

Interpretation Introduction

Interpretation: The equations that illustrates the amphoterism of HCO3 and H2PO4 are to be written.

Concept introduction: When a substance behaves both as an acid and as a base, it is said to be an amphoteric substance. They gives Hydronium ions as well as hydroxide ions in aqueous solution.

Explanation

Explanation

To write: The equations of HCO3 and H2PO4 to illustrates their amphoteric nature.

HCO3 as an acid,

HCO3+H2OCO32+H3O+

HCO3 as base,

HCO3+H2OH2CO3+OH

An anion is said to be amphoteric if it can behaves either as an acid or as a base. Water shows amphoteric nature.

The autoionization of water involves formation of hydroxide ion and a hydronium ion due to transfer of a proton from one water molecule to another. In this reaction, one water molecule acts as acid by donating proton, and the other molecule acts as base by accepting the proton. The reaction is,

Figure 1

The equations of HCO3 to illustrates its amphoteric nature are,

HCO3 as an acid,

HCO3+H2OCO32+H3O+

HCO3 as base,

HCO3+H2OH2

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Chapter 14 Solutions

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