1.

What single reagent solution (including H_(2)O) could be used to effect the separation of the following of solides? a. NaOH and Fe(OH)_(3) b. Ni(OH)_(2) and Fe(OH)_(2) c. Cr_(2)O_(3) and Fe(OH)_(3) d. MnS and CuS e. AgCI and AgI

Answer»

Solution :a.`H_(2)O` can dissolve `NaOH_(2) ,Fe(OH)_(3)` remaininsoluble in water .
b. `NH_(4)OH` dissolves `Ni(OH)_(2)` is insoluble `Ni(OH)_(4) + 4NH_(4) OH rarr underset("Soluble")underset("Soluble")([Ni(NH_(3))_(4)]^(2+))`
C. Execess of `NaOH` can dissoolve `Cr_(2)O_(3)` but `Fe(OH)_(3)` REMAIN insoluble
`Cr_(2)O_(3)+ 3H_(2)O rarr 2Cr(OH)_(3)`
`Cr(OH)_(3) + NaOH rarr underset("Soluble")(Na[Cr(OH)_(4)])`
d.Dilute `HCI` disolves `MnS` souble while `CoS` remaininsoluble
`MnS + 2HCI rarr MnCI_(2) + H_(2)S uarr`
E. `Aq,NH_(3)` would dissolve `AgCI` while `AGI` remaininsoluble
`AgCI + 2NH_(3)(aq) rarr underset("Soluble")([Ag(NH_(3))_(2)]CI)`


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