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Balance the following equation using oxi...

Balance the following equation using oxidation number method
`As_(2)S_(3)+HNO_(3)+H_(2)O rarr H_(3)AsO_(4)+H_(2)SO_(4)+NO`

Text Solution

Verified by Experts

`As_(2)S_(3)+HNO_(3)+H_(2)OrarrH_(3)AsO_(4)+H_(2)SO_(4)+NO`
`overset(+3)(As_(2)S_(3))+overset(+5)(HNO_(3))+H_(2)O rarr overset(+5)(H_(3)AsO_(4))+H_(2)SO_(4)+overset(+2)(NO)`

`As_(2)S_(3)rarrH_(3)AsO_(4)+2e^(-)xx3`
`HNO_(3)+3e^(-)rarrNOxx2`
`3As_(2)S_(3)rarr 3H_(3)AsO_(4)+cancel(6e^(-))`
`3As_(2)S_(3)+2HNO_(3)rarr6H_(3)AsO_(4)+2NO`
To balance oxygen and sulphur, `H_(2)O` and `H_(2)SO_(4)` are added.
`3As_(2 S_(3) + 2HNO_(3)+H_(2)O rarr 6H_(3)AsO_(4)+2NO+H_(2)SO_(4)`
`3As_(2)S_(3)+28HNO_(3)+4H_(2)O rarr 6H_(3)AsO_(4)+28NO+9H_(2)SO_(4)`
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