Chapter 17, Problem 17.12P

(a)

Interpretation Introduction

Interpretation:

Moles of electrons that are delivered at $\text{5}\text{mA}$ for $\text{0}\text{.1}\text{s}$ have to b determined.

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 measuring 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:

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

(b)

Interpretation Introduction

Interpretation:

Volume of $\text{0}\text{.01}\text{M}$ solution of two-electron reducing agent required to deliver $5.1822\times {10}^{-9}\text{mol}$ of electrons has to be calculated.

Concept Introduction:

A reducing agent is a substance that donates electrons to other elements and oxidized itself. A general reduction reaction can be written as follows:

    $\text{Reducing}\text{agent}\to \left(\text{Oxidised}\text{form}\text{of}\text{reducing}\text{agent}\right)+{\text{ne}}^{-}$

Molarity of a solution is defined as the moles of substances dissolved in $\text{1}\text{L}$ solution.