Chapter 15, Problem 15.45P

Interpretation Introduction

Interpretation:

The separate solutions method was used to measure the selectivity coefficient for a sodium ion-selective method at $\text{21}{\text{.5}}^{\text{0}}\text{C}$ , ${\text{logK}}^{\text{Pot}}$ for each line 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.

To find the selectivity coefficient the difference between the line for an interfering ion and the ${\text{Na}}^{\text{+}}$ calibration line at any chosen activity.

${\text{logK}}_{\text{A,X}}^{\text{Pot}}\text{=}\frac{{\text{z}}_{\text{A}}\text{F}\left({\text{E}}_{\text{X}}{\text{-E}}_{\text{A}}\right)}{\text{RT}\text{ln}\text{10}}\text{+log}\left(\frac{{\text{A}}_{\text{A}}}{{\left({\text{A}}_{\text{X}}\right)}^{\text{zA/zB}}}\right)$