   Chapter 19, Problem 23PS

Chapter
Section
Textbook Problem

Which of the following elements is the best reducing agent under standard conditions? (a) Cu (b) Zn (c) Fe (d) Ag (e) Cr

Interpretation Introduction

Interpretation:

The best reducing agent among the following has to be identified.

a)Cu        d)Agb)Zn        e)Crc)Fe

Concept introduction:

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

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Find more solutions based on key concepts 