Question

Balance the net equtation fro th reaction of potassium dichromate (VI), `K_(2) Cr_(2) O_(7)`, with sodium sulphite, `Na_(2)SO_(3)`, in an acid solution to give chromium (III) ion and and sulphate ion.
Strategy : Follow the seven -step proceduce , one step at a time.

Answer 1

Skeleton equation is
`Cr_(2)O_(7)^(-) + SO_(3)^(2-) to Cr^(3+) + SO_(4)^(2-)`

`Cr_(2)O_(7)^(2-) +3SO_(3)^(2-) to 2Cr^(3+) + 3SO_(4)^(2-)`
`Cr_(2)O_(7)^(2-) + 3SO_(3)^(2-) to 2Cr^(3+) + 3SO_(4)^(2-) + 4H_(2)O`
`Cr_(2)O_(7)^(2-) + SO_(3)^(2-) + 8H^(+) to 2Cr^(3+) + 3SO_(4)^(2-) + 4H_(2)O`