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Introduction to Inorganic Chemistry

Fe OH 3 can ...

Question

${F e (O H)}_{3}$ can be separated from ${A l (O H)}_{3}$ by the addition of:

A

N a C l

solution

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B

dil.

H C l

solution

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C

N a O H

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D

{N H}_{4} C l

and

{N H}_{4} O H

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Solution

The correct option is C $N a O H$ solution
${F e}^{3 +}$ and ${A l}^{3 +}$ both beongs to group IIIrd of inorganic analysis and both are precipitated as their hydroxides on adding group reagent, ie, ${N H}_{4} O H$ in presence of ${N H}_{4} C l$ .
${F e}^{3 +} + 3 {O H}^{-} ⟶ {F e (O H)}_{3}$
${A l}^{3 +} 3 {O H}^{-} ⟶ {A l (O H)}_{3}$
but only ppt of ${A l (O H)}_{3}$ is soluble in $N a O H$ solution.

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Similar questions

F e (O H)_{3}

can be separated from

A l (O H)_{3}

by addition of:

F e (O H)_{3}

can be separated from

A l (O H)_{3}

by addition of?

{F e (O H)}_{3}

{A l (O H)}_{3}

ppt. can be separated by

N a O H

{A l (O H)}_{3}

becomes soluble due to the formation of

{N a A l O}_{2}

{F e (O H)}_{3}

remains insoluble.

X

dissolves both in dilute

H C l

N a O H

H_{2}

N H_{4} C l

N H_{4} O H

H C l

X

Y

as a precipitate.

Y

is also produced by adding

N H_{4} C l

N a O H

X

X

Y

, respectively, are:

Q. A mixture of

A l (O H)_{3}

F e (O H)_{3}

can be separated by:

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