Chapter 17, Problem 17.19P

Interpretation Introduction

Interpretation:

Fraction of ascorbic acid oxidized has to be calculated. Whether the concentration of ascorbic acid throughout the process is constant or not has to be stated.

Concept Introduction:

In analytical chemistry, coulometric titration is a method in which the titrating agent is produced in a solution by electrolysis. Amount of that substance is determined by measure of the quantity of electricity used to electrolyze that substance. For coulometric titration, no standard solution is needed.

Moles of electron flow in a coulometric titration are calculated by the equation as follows:

    $\text{Moles}\text{of}\text{electron}\text{flow}=\frac{\left(\text{Electric}\text{current}\text{in}\text{amperes}\right)\left(\text{time}\text{in}\text{second}\right)}{\text{Faraday}\text{constant}}$