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Zinc Ion

If NH4OH in...

Question

If $N H_{4} O H$ in presence of $N H_{4} C l$ is added to a solution containing $A l_{2} (S O_{4})_{3}$ and $M g S O_{4}$ , which of the following will precipitate?

A

A l (O H)_{3}

only

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B

M g (O H)_{2}

only

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C

A l (O H)_{3}

and

M g (O H)_{2}

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D

None of these

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Solution

The correct option is A $A l (O H)_{3}$ only
The sparing solute hydroxides derived from $F e^{3 -}, C r^{3 -}$ and $A I^{3 +}$ ions are precipitated by the addition of ammonia hydroxide, $(N H_{4} O H)$ solute in the presence of excess ammonium chloride, $N H_{4} C I$ and $N H_{4} O H$ helps in maintaining the $p H$ ,

$H y d r o x i d e$ $K$ at $25^{\circ} C$
$A I (O H)_{3}$ $1.4 \times 10^{- 34}$

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Similar questions

(1)

Z n (O H)_{2}

(2)

C r (O H)_{3}

(3)

M g (O H)_{2}

(4)

A l (O H)_{3}

which hydroxide is precipitated by

N H_{4} O H

N H_{4} C l

?

Q. Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing

0.05 {mol L}^{- 1}

N H_{4} O H

0.25 {mol L}^{- 1}

N H_{4} C l

. Calculate the concentration of magnesium ions in solution.

K_{s p} A l (O H)_{3} = 6 \times 10^{- 32}

K_{b} N H_{4} O H = 1.8 \times 10^{- 5}

K_{s p} M g (O H)_{2} = 6 \times 10^{- 10}

Q. The number of compounds which are having only acidic nature is ________.

B e (O H)_{2}, M g (O H)_{2}, A l (O H)_{3}

B (O H)_{3}

Q. To a solution of

0.1 M

M g^{2 +}

0.8 M

N H_{4} C l

, an equal volume of

N H_{3}

is added which just gives precipitate. Calculate

[N H_{3}]

K_{s p}

M g (O H)_{2} = 1.4 \times 10^{- 11}

K_{b}

N H_{4} O H = 1.8 \times 10^{- 5}

Q. What is the ratio of mole

M g (O H)_{2}

A l (O H)_{3}

in one litre in their saturated solution?

K_{s p}

M g (O H)_{2} = 4 \times 10^{- 12}, A l (O H)_{3} = 1 \times 10^{- 33}

Give answer by multiplying it with

10^{- 17}

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