Chapter 18, Problem 18.10QP

Interpretation Introduction

Interpretation: The standard emf of a cell uses Mg/ ${\text{Mg}}^{\text{2+}}$  and Cu/ ${\text{Cu}}^{2+}$ half -cell reaction at ${\text{25}}^0$ C should be calculated and represented through cell reaction under standard state condition.

Concept Introduction:

Redox reaction are those in which oxidation number changes.

Half reaction are the separated oxidation and reduction reaction that make up the overall redox reaction.

Redox equation can be balanced via the half –reaction methods, which allows for the addition of ${\text{H}}_{\text{2}}\text{O}$ to balance O, ${\text{H}}^{+}$ to balance H, and ${\text{OH}}^{-}$ for taking place in basic solution.

Standard EMF:

The electromotive force (EMF) is the maximum potential difference between two electrodes of a galvanic cell.

This quantity is related to the tendency for an element.

i.e.- It has a great tendency to acquire or gain the compound.

Half-cell Reaction: A half-cell is one of the two electrodes in a galvanic cell..

Example, the Zn-Cu battery, the two half cells make an oxidizing couple.

Electrochemical cell:

An electrochemical cell in which a spontaneous chemical reaction generates a flow of electrons through a wire is called a galvanic cell.