Complete and balance the following in acidic medium:
`Ag^(o+)+AsH_(3)rarrH_(3)AsO_(3)`

Explanation

`Aoverset(+1)(g^(o+))+Aoverset(-3)sH_(3)rarrH_(3)Aoverset(+3)sO_(3)`
a. `As^(3-)rarrAs^(3+)`(oxidation)
b. `Ag^(o+)rarrAg^(x) x=?`
Clearly. (b) must be a reduction, so `x` must be `0`, as `x` cannot be negative for `Ag` (silver being metal).
a. `As^(3-)rarrAs^(3+)+6e^(-)`
b. `Ag^(o+)+1e^(-)Ag^(0)`
`As^(3-)+6Ag^(o+)rarrAs^(3-)+6Ag^(0)`
`AsH_(3)+6Ag^(o+)rarr6Ag^(0)+H_(3)AsO_(3)`
Now balance charge by adding `6H^(o+)` on right side and finally add `3H_(2)O` on left side.
`AsH_(3)+6Ag^(o+)+3H_(2)OrarrAg+H_(3)AsO_(3)+6H^(o+)`