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Balance the following equation in basic ...

Balance the following equation in basic medium.
`Cr(OH)_(3)+IO_(3)^(-)toCrO_(4)^(2-)+I^(-)`

Text Solution

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Two half reactions are:
a. `Cr(OH)_(3)rarrCeO_(4)^(2-)`
b. `IO_(3)^(ө)rarrI^(ө)`
Balancing `O` atoms:
a. `Cr(OH)_(3)+2overset(ө)OHrarrCrO_(4)^(2-)+H_(2)O`
b. `IO_(3)^(ө)+3H_(2)OrarrI^(ө)+6overset(ө)OH`
Balancing `H` atoms:
a. `Cr(OH)_(3)+2overset(ө)OH+3overset(ө)OHrarrCrO_(4)^(2-)+H_(2)O+3H_(2)O`
b. `IO_(3)^(ө)+3H_(2)OrarrI^(ө)+6overset(ө)OH`
Balancing the charge:
a. `Cr(OH)_(3)5overset(ө)OHrarrCrO_(4)^(2-)+4H_(2)O^(+)3e^(-)`
b. `IO_(3)^(ө)+3H_(2)O+6e^(-)rarrI^(ө)+6overset(ө)OH`
Adding (a) and (b), we get
`2Cr(OH)_(3)+IO_(3)^(ө)+4overset(ө)OHrarr2CrO_(4)^(2-)+I^(ө)+5H_(2)O`
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