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ChemistryChemistry: An Atoms First Approach2nd Edition
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Phosphoric acid (H 3 PO 4 ) is a triprotic acid, phosphorous acid (H 3 PO 3 ) is a diprotic acid, and hypophosphorous acid (H 3 PO 2 ) is a monoprotic acid. Explain this phenomenon.

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 19, Problem 51E
Textbook Problem
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Phosphoric acid (H3PO4) is a triprotic acid, phosphorous acid (H3PO3) is a diprotic acid, and hypophosphorous acid (H3PO2) is a monoprotic acid. Explain this phenomenon.

Interpretation Introduction

Interpretation: The phenomenon of monoprotic, diprotic and triprotic acid is to be explained using the examples of phosphoric acid, phosphorous acid and hypophosphorous acid.

Concept introduction: Proticity of acid depends on the number of H+ ions that can be liberated.

To determine: An explanation for the phenomenon of monoprotic, diprotic and triprotic acid using the examples of phosphoric acid, phosphorous acid and hypophosphorous acid.

Explanation of Solution

Explanation

Phosphoric acid (H3PO4) is a triprotic acid.

The ability of an acid to dissociate three H+ ions in an aqueous solution is known as triprotic acid. Phosphoric acid is a triprotic acid because it can dissociate three H+ ions. The reaction is,

H3PO4(aq)→H+(aq)+H2PO4−(aq)H2PO4−(aq)⇌H+(aq)+HPO42−(aq)HPO42−(aq)⇌H+(aq)+PO43−(aq)

Phosphorous acid (H3PO3) is a diprotic acid because it can dissociate two H+ ions

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