   Chapter 19, Problem 26PS

Chapter
Section
Textbook Problem

From the following list, identify the ions that are more easily reduced than H+(aq). (a) Cu2+(aq) (b) Zn2+(aq) (c) Fe2+(aq) (d) Ag+(aq) (e) Al3+(aq)

Interpretation Introduction

Interpretation:

To identify which of the following ions are easily reduced than H+(aq).

a)Cu2+(aq)        d)Ag2+(aq)b)Zn2+(aq)        e)Cr2+(aq)c)Fe2+(aq)

Concept introduction:

Standard electrode potential

Under certain conditions a cell potential is measured it is called as standard potential (Ecello).

Standard potential (Ecello) can be calculated by the following formula.

Ecello=Ecathodeo-Eanodeo

The Ecello value is positive, the reaction is predicted to be product favoured at equilibrium.

The Ecello value is negative, the reaction is predicted to be reactant favoured at equilibrium.

Electrochemical series:

It is a decreasing order of the reduction potentials. The most positive E0 are placed in the top in the electrochemical series, it has greater tendency for reduction and lower tendency of oxidation. And the most negative E0 values of elements are placed in the bottom of the series.

Explanation

Reasons for correct answer:

Let’s write the E0 values of the given elements.

a) Cu2+(aq) + 2e- Cu(s) ;Eo= + 0.337 Vb) Zn2+(aq) + 2e- Zn(s) ;E0= - 0.763 Vc) Fe2+(aq) + 2e- Fe(s)  ;E0= - 0.44 Vd) Ag+(aq) + e- Ag(s)   ;E0= + 0.794 Ve) Al3+(aq) + 3e- Al(s)  ;E0= -1

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