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What is the oxidation state of an individual bromine atom in NaBrO_3?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What is the oxidation state of iodine in the ion IO_3^-?
A
-1
B
+1
C
+3
D
+5
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Identify the oxidation state of oxygen in the ion IO_3^-. Oxygen almost always has an oxidation state of -2 in compounds.
Let the oxidation state of iodine be x. Since there are three oxygen atoms, the total oxidation state contributed by oxygen is 3 \(\times\) (-2) = -6.
The overall charge of the ion IO_3^- is -1. Set up the equation for the sum of oxidation states: x + (-6) = -1.
Solve the equation for x: x - 6 = -1, so x = -1 + 6.
Calculate x to find the oxidation state of iodine, which will be +5.
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