# Chemistry

posted by .

Balance the ewuation using thr oxidation number method

Here is what i did

Au+ + H20---> Au2O3 + Au + H+

Au+ losses 3e- to form Au2O3-->oxidation
Au+ gets reduced to for Au

therefore the balanced chemical equation is 3Au+ + 3H20---> Au2O3 +Au +6H+

Does it make sense?

• Chemistry -

Yes and no.
The equation isn't balanced. (I know it looks balanced at first glance but it isn't.)
To be balanced, an equation must
1. have the same number of atoms on each side
2. have the same charge on each side.
3. electrons lost = electrons gained.
The charge doesn't balance (3+ on left and 6+ on right).
Electron change doesn't balance.

Here is the way I would do it.
Au^+ ==> Au2O3
First you make the Au atoms equal so we don't "split" charges.
2Au^+ ==> Au2O3
Oxidation state is +2 on left for 2 atoms and +6 on right for 2 atoms. We balance the change in state with electrons.
2Au^+ ==> Au2O3 + 4e
Count the charge on the left (+2) and right (-4) and balance with H^+.
2Au^+ ==> Au2O3 + 4e + 6H^+
Now add water to the other side to balance the H^+ added.
3H2O + 2Au^+ ==> Au2O3 + 4e + 6H^+

Next half cell.
Au^+ + e ==> Au

Now multiply the first equation by 1 and the second equation by 4 and add to obtain
3H2O + 6Au^+ ==> Au2O3 + 4Au + 6H^+
1. atoms balance 6H left and right. 3 O left and right. 6 Au left and right.
2. charge balances. +6 on left and right.
3.electron change balances. 2Au^+ on left move to Au2O3 where both Au atoms are +6. Loss of 4e. Other 4 Au^+ atoms move to 4Au on right. Gain of 4e.
Done.

## Similar Questions

1. ### CHEMISTRY

is the oxidation number for platinum larger than the oxidation number for osmium?

Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O b) MnO4- + H+ + Cl- --> Mn2+ + Cl2 + H2O I know how to give each atom oxidation number but after i don't know how to …

Question: Balance the following reactions by the oxidation number method. a) I2 + HNO3 --> HIO3 + NO2 + H2O so i have N +5 to +4 net charge = -1 I 0 to +5 net charge = +5 i add coefficient where the oxidation number is changing. …
4. ### Chem

what occurs during the reaction below 4Hcl+MnO2-->MnCl2+2H2O+Cl2 1.the manganese is reduced and its oxidation number changes from +4 to +2. 2.the manganese is oxidized and its oxidation number changes from +4 to +2. 3.the manganese …
5. ### Chemistry

Balance the following redox equation by the oxidation number methode Ag + HNO3 = AgNO3 + NO + H2O I have all the oxidation numbers i just don't understand how i'm supposed to balance it according to them. I read the sites and i can't …
6. ### chemistry

Using the change-in-oxidation-number method, balance the redox reaction below. Show your work; partial credit will be given. NO2– + MnO4– → NO3– + Mn2+ Figure out which atoms’ oxidation numbers are changing, and by how …
7. ### chemistry

Balance using oxidation Number Methode A. MnO4- + C2H4 + H20 --> MnO2 + OH- + C2H6 B. ClO- --> Cl- +
8. ### chemistry

Balance using oxidation Number Methode A. MnO4- + C2H4 + H20 --> MnO2 + OH- + C2H6 B. ClO- --> Cl- + ClO3-
9. ### chemistry

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride?
10. ### chemistry

Balance following oxidation reduction reactions using oxidation states method?

More Similar Questions