Chapter 5, Problem 5.34P

Interpretation Introduction

Interpretation:

How the composition of an aqueous solution of glycine varies with $pH$ has to be described. 

Concept Introduction:

Speciation:

Speciation is the specification of the fractional composition of ions in a solution.  The speciation of a diprotic acid depends on the $pH$ of the solution. 

Consider each successive conjugate acid–base pair, with acidity constant $K_{an}$; with $n=1,2,\dots$ Then:

• The acid form is dominant for $pH<p{K}_{an}$
• The conjugate pair have equal concentrations at $pH=p{K}_{an}$
• The base form is dominant for $pH>p{K}_{an}$