Question 16.4: Using Oxidation States to Identify Oxidation and Reduction U......

Introductory Chemistry [1015808]

Using Oxidation States to Identify Oxidation and Reduction

Use oxidation states to identify the element that is being oxidized and the element that is being reduced in the redox reaction.

$\mathrm{Ca}(s)+2\,{\mathrm{H}}_{2}{\mathrm{O}}(l)\,\longrightarrow\,\mathrm{Ca}({\mathrm{OH}})_{2}(a q)+\mathrm{H_{2}(g)}$

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Assign an oxidation state to each atom in the reaction. Ca increased in oxidation state; it was oxidized. H decreased in oxidation state; it was reduced. (Note that oxygen has the same oxidation state on both sides of the equation and was therefore neither oxidized nor reduced.)

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