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OpenStudy (anonymous):
What is the oxidation number of As in As04-3
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OpenStudy (jfraser):
the total charge of the ion will be equal to the sum of the charges of all the pieces, right?
OpenStudy (anonymous):
Since the sum of all oxidation states in a compound must equal 0 and Oxygen has an oxidation state of -2, then \[1x(#As) + 4x(#O) = -3\] \[#As + 4x(-2) = -3\] \[#As - 8 = -3\] \[#As = +5\]
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