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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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Explain why, although it is not an ionic compound, we still assign oxygen an oxidation state of −2 in water, H2O. Give an example of a compound in which oxygen is not in the −2 oxidation state.

Interpretation Introduction

Interpretation:

The explanation should be provided for why the oxidation state of oxygen in water is assigned -2 and an example of a compound in which oxygen is not in the -2 oxidation state should be given.

Concept Introduction:

The oxidation state is defined as the charge(s) that an atom would have when electron(s) were transferred completely from a molecule or ion.

Explanation

For molecule bonded by covalent bond between the atoms, the shared pair of electrons in the bond lies closer to that atom which is more electronegative. Since, for H2O (water) the bond between hydrogen and oxygen is polar covalent bond due to the higher electronegativity for oxygen in comparison to hydrogen so, the shared pair of electron will lie closer to oxygen.

For neutral molecules the sum of oxidation state is 0.

For H2O :

The oxidation state of hydrogen is + 1. Let the oxidation state of oxygen be x

2(1)+x=0x

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