   Chapter 18, Problem 65E

Chapter
Section
Textbook Problem

# Hydrazine is somewhat toxic. Use the half-reactions shown below to explain why household bleach (a highly alkaline solution of sodium hypochlorite) should not be mixed with household ammonia or glass cleansers that contain ammonia.     ClO −   +   H 2 O   +   2e −   →   2OH − 1   +   Cl −   E °   =   0.90   V N 2 H 4 +   2 H 2 O   +   2e −   →   2 NH 3   +   2 OH −   E °   =   − 0.10   V

Interpretation Introduction

Interpretation:

Reason for why not allow the mixing of Ammonia with household bleach be should explained.

Concept introduction:

Electromotive force:

The potential difference between two electros in the galvanic cell is known as electromotive force (EMF) and it is given by

Ecell=Ecathode-Eanode

The loss of electron is oxidation and this is occurs in anode.

The gain of electron is reduction and this is occurs in cathode.

If the EMF is positive the cell reaction will take place spontaneously.

If the EMF is negative the cell reaction will not take place spontaneously.

Explanation

The spontaneity of the reaction of Ammonia with household bleach is calculated below,

Given,

ClO-+H2O+2e-2OH-+Cl-=0.90VN2H4+2H2O+2e-2NH3+2OH-=-0.10V

The EMF of the cell is,

Ecell=Ecathode-Eanode

Consider the highest positive value is cathode

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