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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The following reaction is used in a device for testing the breath of a person for the presence of ethanol. Identify the oxidizing and reducing agents, the substance oxidized, and the substance reduced.

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Interpretation Introduction

Interpretation:

Oxidizing and reducing agents, the substance oxidized and the substance reduced in the given chemical reaction should be identified.

Concept introduction:

An oxidizing agent gains the electrons and is reduced in a chemical reaction and it is electron acceptor.  A reducing agent loses electrons and is oxidized in a chemical reaction and it is electron donor.  The oxidation state is called as oxidation number, which describes degree of oxidation (loss of electrons) of an atom in a chemical compound.  Theoretically, the oxidation state is positive, negative or zero.

Explanation

The given reaction is shown below,

The given compound is Cr2O72- and which is not a neutral compound.  Therefore the overall charge is -2.

The oxidation number of oxygen is -2, therefore the oxidation state of  Cr in Cr2O72- is given below,

Net charge on Cr2O72- is equal to sum of the oxidation number of seven oxygen atoms.

Therefore,

Net charge = Number of oxidation state of oxygen atom -2 = (2x)x

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