Chapter 15, Problem 15.46P

Interpretation Introduction

Interpretation:

The relative error in primary ion due to an interfering ion is

$\text{\%}\text{error}\text{in}{\text{Α}}_{\text{A}}\text{=}\frac{{\left({\text{K}}_{\text{A,X}}^{\text{Pot}}\right)}^{\raisebox{1ex}{${\text{z}}_{\text{X}}$}\!\left/ \!\raisebox{-1ex}{${\text{z}}_{\text{A}}$}\right.}}{{\text{Α}}_{{}_{\text{A}}}^{{}^{\raisebox{1ex}{${\text{z}}_{\text{X}}$}\!\left/ \!\raisebox{-1ex}{${\text{z}}_{\text{A}}$}\right.}}}\text{×100}$

The above expression is applied for $\sim 10\%$.

The relative error in measuring ${\text{A}}_{{\text{H}}^{\text{+}}}$ has to be calculated.

Concept Introduction:

Ion-selective electrode:

An ion-selective electrode (ISE) best known as a specific ion electrode (SIE), is a sensor (or transducer) that transforms the activity of a specific ion dissolved in a solution into an electrical potential.

The relative error in primary ion due to an interfering ion is

$\text{\%}\text{error}\text{in}{\text{Α}}_{\text{A}}\text{=}\frac{{\left({\text{K}}_{\text{A,X}}^{\text{Pot}}\right)}^{\raisebox{1ex}{${\text{z}}_{\text{X}}$}\!\left/ \!\raisebox{-1ex}{${\text{z}}_{\text{A}}$}\right.}}{{\text{Α}}_{{}_{\text{A}}}^{{}^{\raisebox{1ex}{${\text{z}}_{\text{X}}$}\!\left/ \!\raisebox{-1ex}{${\text{z}}_{\text{A}}$}\right.}}}\text{×100}$