Multiple Choice
Which of the following is an oxidation half-reaction?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What are the oxidation numbers of arsenic and oxygen in the arsenate ion, AsO_4^{3-}?
A
Arsenic: +3, Oxygen: -2
B
Arsenic: +5, Oxygen: -1
C
Arsenic: +3, Oxygen: -1
D
Arsenic: +5, Oxygen: -2
Verified step by step guidance1
Recall that the oxidation number of oxygen in most compounds is typically -2.
Let the oxidation number of arsenic (As) be represented as x.
The arsenate ion has the formula \(\mathrm{AsO_4^{3-}}\), meaning the overall charge on the ion is -3.
Set up the equation for the sum of oxidation numbers: \(x + 4(\text{-}2) = \text{-}3\).
Solve the equation for x to find the oxidation number of arsenic.
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