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Standard XII

Chemistry

Oxyacids of Phosphorus

Formula of mi...

Question

Formula of microcosmic salt is:

{N a}_{2} H {P O}_{4}

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N a ({N H}_{4}) H {P O}_{4}

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K_{2} H {P O}_{4}

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{N a}_{2} {P O}_{4} . K_{2} {P O}_{4}

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Solution

The correct option is A $N a ({N H}_{4}) H {P O}_{4}$
Microcosmic salt formula is $(N H_{4}) N a H P O_{4}$ . It is left behind in the residues after extracting the urea from dried urine crystals with alcohol. In the mineral form, microcosmic salt is called stercorite.

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Similar questions

Q. In a buffer solution consisting

N a H_{2} {P O}_{4}

and

{N a}_{2} H {P O}_{4}

(1)

N a H_{2} {P O}_{4}

is acid and

{N a}_{2} H {P O}_{4}

is salt
(2) The pH of solution can be calculated using the relation:

p H = p K_{2} + {log}_{10} \frac{[H {P O}_{4}^{2 -}]}{[H_{2} {P O}_{4}^{-}]}

(3) The

{N a}_{2} H {P O}_{4}

is acid and

N a H_{2} {P O}_{4}

is salt
(4) The pH cannot be calculated.

Q. How much

{N a}_{2} H {P O}_{4}

must be added to one litre of

0.005 M

solution of

N a H_{2} {P O}_{4}

in order to make

1 L

of the solution of

p H = 6.7

K_{1} = 7.1 \times 10^{- 3}

;

K_{2} = 6.3 \times 10^{- 8}

;

K_{3} = 4.5 \times 10^{- 13}

for

H_{3} {P O}_{4}

H_{3} {P O}_{4}

is a tribasic acid and one of its salt is

{N a H}_{2} {P O}_{4}

What volume of

1 M N a O H

solution should be added to

12 g {N a H}_{2} {P O}_{4}

to convert it into

{N a}_{3} {P O}_{4}

? (

a t . w t

P = 31

)

Q. Three reactions involving

H_{2} {P O}_{4}^{-}

are given below:
(i)

H_{3} {P O}_{4} + H_{2} O \to H_{3} O^{+} + H_{2} {P O}_{4}^{-}

(ii)

H_{2} {P O}_{4}^{-} + H_{2} O \to H {P O}_{4}^{2 -} + H_{3} O^{+}

(iii)

H_{2} {P O}_{4}^{-} + {O H}^{-} \to H_{3} {P O}_{4} + O^{2 -}

Q. Calculate

[H^{+}]

[H_{2} {P O}_{4}]

[H P O_{4}^{2 -}]

and

[{P O}_{4}^{3 -}]

in a

0.01 M

solution of

H_{3} {P O}_{4}

.
Take

K_{1} = 7.225 \times 10^{- 3}

K_{2} = 6.8 \times 10^{- 8}

K_{3} = 4.5 \times 10^{- 13}

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Formula of microcosmic salt is:

The correct option is A Na(NH4)HPO4Microcosmic salt formula is (NH4)NaHPO4. It is left behind in the residues after extracting the urea from dried urine crystals with alcohol. In the mineral form, microcosmic salt is called stercorite.

The correct option is A $N a ({N H}_{4}) H {P O}_{4}$
Microcosmic salt formula is $(N H_{4}) N a H P O_{4}$ . It is left behind in the residues after extracting the urea from dried urine crystals with alcohol. In the mineral form, microcosmic salt is called stercorite.