As2o3(s)+no−3(aq)→h3aso4(aq)+n2o3(aq) (acidic solution)

Complete and balance the foloowing equation:

As2O3(s)+NO3^-(aq)---->H3AsO4(aq)+N2O3(aq) (acidic solution)

Answer


b) As2O3 + 5H2O >> 2 H3AsO4 + 4H+ + 4e-
2 NO3- + 6H+ + 4e- >> N2O3 + 3H2O
--------------------------------------...
As2O3 + 2 NO3- + 2H2O + 2H+ >> 2 H3AsO4 + N2O3
As goes from +3 to +5
N goes from +5 to +3

or

As2O3 > 2 H3AsO4 & 4 e- lost .......(2 As+3 each --> 2 As+5 each)
2 (NO3)-1 & & 4 e- taken > N2O3 ... (2 N+5 each --> 2 N+3 each)

since they are balanced in electrons taken & lost, combine them:
1As2O3(s) + 2NO3-(aq) > 2H3AsO4 (aq) + N2O3 (aq)

the imbalances are:
zero H's <-> 6 H's
9 oxygens <-> 11 oxygens
-2 ion charge <-> no charge

I will be able to later balance the need on the left for H's & O's with neutral H2O later, so I am going to balance the charges first, by adding 2 negative hydroxides to the right side:
As2O3(s) + 2NO3-(aq) > 2H3AsO4 (aq) + N2O3 (aq) & 2 OH-

with the charges now balanced, I notice that I now have an excess of 8 Hydrogens & 4 oxygens on the right , which can be balanced by adding 4 H2O's to the left:

1As2O3(s) + 2NO3-(aq) & 4 H2O > 2H3AsO4 (aq) + 1N2O3 (aq) & 2 OH-

As2O3 + 2 NO3- + 2H2O + 2H+ -------->> 2 H3AsO4 + N2O3
As goes from +3 to +5
N goes from +5 to +3

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