Question

Balance the following equations in the specified medium by oxidation number method As S3 (s) + NO3 (aq) AsO2 (aq) + NO(g) + S(s) Acidic medium​

Answer 1

Answer:

Step  1 :  To identify the atoms whose oxidation number have undergone a change . writing the oxidation number of each atom above its symbol , we have

+3−2As2S3++5NO3−(aq)+H+⟶+5AsO43−(aq)+0S(g)++2NO2(g)+H2O(l)

Step  2 : 

oxidation:=+32As2S3(s)→+5AsO43−+0S(s)....(i) 

p As from +3to +5 i.e. 2 unit change S from to  o also 2in change] 

Reduction  : +5NO3−(aq)⟶+2NO(g) [ M is from +5 to +2,3 unit choice ] ...(ii) 

Step  - 3 - to balance the oxidation half eq (i) 

(a) balance all the atoms other than H and O . multiply AsO43+ by 2 and S by 3 on RHS of eq (i) we have

+3−2As2S3