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How might you separate the following pai...

How might you separate the following pairs of ions by addition of singles reagent include formula for the major products of the reactions(a)`Fe^(3+)`and`Na^(+)`(b)`Cr^(3+)`and`Fe^(3+)`(c )`Fe^(2+)`and `Cu^(2+)`

Text Solution

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(a)`Fe^(3+)`and Na
Add KOH(excess),`Fe^(3+)`is precipitaed as `Fe(OH)_(3)` Na remains in solution
`Fe^(3+)(aq)+3OH(aq)toFe(OH)_(3)(s)darr`
(b) `Cr^(3+)` and `Fe^(3+)`
Add KOH(excess),ofaq NaOH,`Fe^(3+)` is precipitated as Fe(Oh) while `Cr(OH)_(3)` First formed dissolves in excess of aq.`NaOHFe^(3+)`
`(aq)+3OH(aq)toFe(OH)_(3)(s)overset(OH)^(-))to`does not dissolve
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