# Chemistry

Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron.

U^4+ --> UO2^+

There is a hint: In acidic solution, you may add H2O and H as needed to balance oxygen and hydrogen. When finished, don\'t forget to balance the charge by adding e– as needed.

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1. I wonder if that is [UO2]^2+?
U^4+ ==> UO2^+
Here is how I do it which is not the short way.
Oxidation state of U on left is +4. On right is +5. Balance the change in oxidation state by adding electrons to the appropriate side.
U^4+ ==> UO2^+ + e

Count the charge on the left and right. +4 on the left; zero on the right so we add H^+ to the right to balanced the charge.
U^4+ ==> UO2^+ + e + 4H^+
Then add H2O to the other side to balance.
U^4+ + 2H2O ==> UO2^+ + e + 4H^+

but I really think you meant for that ion on the right to be [UO2]^2+

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