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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. Assign the oxidation state for the element listed in each of the following compounds:

    Oxidation State
    S in MgSO4 ___________
    Pb in PbSO4 ___________
    O in O2 ___________
    Ag in Ag ___________
    Cu in CuCl2 ___________

Interpretation Introduction

Interpretation:

The oxidising state for the elements should be determined.

Concept Introduction:

The oxidation and reduction can be identified by change in oxidation state. If oxidation state of atom of an element increases, it undergoes oxidation and if it decreases, it undergoes reduction.

The general oxidation and reduction half reactions are as follows:

AsA+aq+e

Here, As undergoes oxidation to form A+aq with release of 1 electron. The oxidation state of A increases from 0 to 1.

Similarly,

B+aq+eBs

Here, B+aq undergoes reduction to form Bs with addition of 1 electron. The oxidation state of A decreases from 1 to 0.

Explanation

(1) The given compound is MgSO4. The most common oxidation state of oxygen and magnesium is -2 and + 2 respectively. Thus, using them, oxidation state of S in MgSO4 can be calculated.

Let the oxidation state of S be x thus,

+2+x+42=0+2+x8=0x6=0x=+6

Thus, oxidation state of S in MgSO4 is + 6.

(2) The given compound is PbSO4. This can be written in ionized form as Pb2+ and SO42.

Thus, oxidation state of Pb in PbSO4 is + 2.

(3) The given species is O2, this is oxygen in its natural state

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