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An acidic aqueous solution contains 0.02...

An acidic aqueous solution contains `0.02M - FeCI_(2)` and `0.05 M -FeCI_(3)`, at `25^(@)C`. Now `NaOH` solution is added is this solution, drop bydrop. The pH range in which only the precipitation of `Fe(OH) (s)` occur without precipitation of `Fe(OH)_(2)(s)` differs by 'x' unit. The value of 'x' is given :
`K_(sp)` of `Fe(OH)_(2) = 8 xx 10^(-16)`
`K_(sp)` of `Fe (OH)_(3) = 4 xx 10^(-28)`

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