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Oxidation State

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mindice yew

on 17 December 2010

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Transcript of Oxidation State

State also known as Oxidation Number Oxidation state (number) is the charge an atom would have if existed as an ion Rule #1 Atoms of an element are assigned an oxidation number of 0. Rule #2 For ions of elements, oxidation number corresponds to charge of ions. Rule #3 Oxidation number of hydrogen atoms is +1, except when bonded with metals
Rule #4 Oxidation number of oxygen is usually -2, except in peroxides, oxidation number is -1. Rule #5 Sum of oxidation numbers of all atoms of an electrically neutral compound is 0. Sum of oxidation number of all atoms is equal to the overall charge of the ion.
Rule #6 HCl NaH Sodium Hydride Aluminium Hydride normally,
oxidation number of Hydrogen is +1 when bonded with metals, oxidation number of hydrogen is -1 hydrogen peroxide OXIDATION NUMBER CHARGE
NUMBER 2-, 1-, 2+ +2, -1, +3 number first,
sign next sign first,
number next +2 + 2(-1) = 0 +4 + 2(-2) = 0 What is the oxidation state of S? -2 + (+1) = -1 Let x be the O.S. of Sulfur x + 4(-2) = -2 x = +6 What is the oxidation state of N? Electron transfer takes place and there is a change in oxidation state.
Why are we learning about Oxidation State? oxidation number of oxygen = -1 here,
oxidation number of oxygen = -2
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