[granite350]

Balancing Redox Reactions.  Balance the following redox reactions by the half-reaction method.  This topic is discussed on pages 803 - 807 [840 - 845] in the textbook.

a.  As2O3(s) + NO3?(aq) ? H3AsO4(aq) + N2O3(aq)      (in acidic solution)

b.  H2O2(aq) + Cl2O7(aq) ? ClO2?(aq) + O2(g)      (in basic solution)

[Alberto_Kravina]

Please show us your attempts.

[granite350]

i can't seem to figure out the charges for AsO3 which i put as 0  H3Aso4 I put -3 

just having trouble with the charges for N2O3(aq)

[Alberto_Kravina]

just having trouble with the charges for N2O3(aq)

I think that you mean the oxidation number.
Oxygen has the Ox-num -2, If you know this it is pretty easy to calculate the oxidation number of nitrogen.

[Borek]

http://www.chembuddy.com/?left=balancing-stoichiometry&right=toc

[granite350]

my problem is trying to find the correct oxidation states
this has always been my problem

[Alberto_Kravina]

I think that you mean the oxidation number.
Oxygen has the Ox-num -2, If you know this it is pretty easy to calculate the oxidation number of nitrogen.

...and there are many other more detailed infos in Borek's link...

[granite350]

Wow thanks guys borek helped me out alot great site or link given.

saved me so much time

anyways is H3AsO4 oxidation number 5 since their are 4 O which is -8 and 3 H at +3 which gives the cetral atom a charge of 5

hope i have the hang of it and off to a good start thanks

[Alberto_Kravina]

anyways is H3AsO4 oxidation number 5 since their are 4 O which is -8 and 3 H at +3 which gives the cetral atom a charge of 5

Yeah! Correct! Oxidation number of Arsenic is +5! Now just write the second half-reaction and that's it!

[granite350]

for N2O3(aq)  is the ox idation state this

O has 3 attoms which is 3*-2 which is has the central atom of 6

[Borek]

for N2O3(aq)  is the ox idation state this

O has 3 attoms which is 3*-2 which is has the central atom of 6

How many nitrogen atoms in N₂O₃?

[granite350]

their are 2 nitrogen atoms this is where i got confused the equation does not work out cannot assign an oxidation and reduction equation

[granite350]

do u divide by 2

[granite350]

Wow this is what i got so far but its not much

AsO3-->H3AsO4+5e-  oxidation half\

NO3-  --> N2O3 + 3H2O(l)

I need to still balance out the hydrogents is the oxidaiton half don't know where to go from here i have a long way to go

[Borek]

AsO3-->H3AsO4+5e-  oxidation half\

Should be As₂O₃.

Assign ON for all four substances involved. And write them here.