Chapter 16, Problem 16.153AP

(a)

Interpretation Introduction

Interpretation: The Lewis structure of phosphorous acid is to be drawn. The ionizable hydrogen atoms in the structure are to be identified and an explanation corresponding to the similar $K_{\text{a}}$ values of phosphoric and phosphorous acid is to be stated.

Concept introduction: The Lewis structures are diagrams that give information about the bonding electron pairs and the lone pairs of electrons in a molecule. They are similar to electron dot structure. The equilibrium constant of an acid dissociation reaction depends on the strength of an acid involved in the reaction.

To determine: The Lewis structure of phosphorous acid.

(b)

Interpretation Introduction

To determine: The ionizable hydrogen atoms in the structure.

(c)

Interpretation Introduction

To determine: An explanation corresponding to the similar $K_{\text{a}}$ values of phosphoric and phosphorous acid.