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What is the oxidation state of boron in Na2B4O7?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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In the compound NH3, what must nitrogen's oxidation state be?
A
+3
B
-3
C
0
D
+5
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Recall that the sum of oxidation states in a neutral compound must be zero.
Assign the oxidation state of hydrogen as +1, since hydrogen is usually +1 when bonded to nonmetals.
Let the oxidation state of nitrogen be x. Since there are three hydrogens, the total contribution from hydrogen is 3 \(\times\) (+1) = +3.
Write the equation for the sum of oxidation states: x + 3 = 0.
Solve for x to find the oxidation state of nitrogen: x = -3.
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