   Chapter 18, Problem 121AE

Chapter
Section
Textbook Problem

# When aluminum foil is placed in hydrochloric acid, nothing happens for the first 30 seconds or so. This is followed by vigorous bubbling and the eventual disappearance of the foil. Explain these observations.

Interpretation Introduction

Interpretation:

The effect of reaction between Aluminum and Hydrochloric acid is given. The reason of vigorous bubbling and disappearance of foil after 30s is to be explained.

Concept introduction:

The formation of an oxide layer over the surface of a metal that prevents it from further attack is called passivity of metal. The formation of this oxide layer prevents the corrosion of the metal also.

To determine: The reason of vigorous bubbling and disappearance of foil after 30s because of reaction between Aluminum and Hydrochloric acid.

Explanation

The reaction between Aluminum and Hydrochloric acid is represented as,

2Al+6HCl2AlCl3+3H2

The oxidation of Aluminum is represented as,

AlAl3++3e (1)

The reduction of H+ ions is represented as,

2H++2eH2 (2)

Multiply equation (1) with a coefficient of 2 and equation (3) with a coefficient of 3 and then add the equation as,

2Al2Al3++6e6H

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