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Preparations and Uses of Caustic Soda

The pair of c...

Question

The pair of compounds which cannot exist together in the solution is:

A

N a H C O_{3}

and

N a O H

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B

N a H C O_{3}

and

H_{2} O

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C

N a H C O_{3}

and

N a_{2} C O_{3}

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D

N a_{2} C O_{3}

and

N a O H

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Solution

The correct option is A $N a H C O_{3}$ and $N a O H$
$N a O H$ and $N a H C O_{3}$ can not exist together in the solution as they react with each other. $N a H C O_{3}$ is acidic and is decomposed by $N a O H$ forming $N a_{2} C O_{3}$ . The reaction is as follows:
$N a H C O_{3} + N a O H \to N a_{2} C O_{3} + H_{2} O$

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Similar questions

Q. A mixture of

N a H C O_{3}

N a_{2} C O_{3}

weighed .0235 g. The dissolved mixture was reacted with excess of

8 a (O H)_{2}

2.1028 g B a C O_{3}

, by the following reactions:

N a_{2} C O_{3} + B a (O H)_{2} \to B a C O_{3} + 2 N a O H

N a H C O_{3} + B a (O H)_{2} \to B a C O_{3} + N a O H + H_{2} O

What was the percentage of

N a H C O_{3}

in the original mixture ?

Q. A 2 g sample containing

N a_{2} C O_{3}

N a H C O_{3}

loses 0.62 g when heated to

300^{o} C,

the temperature at which

N a H C O_{3}

N a_{2} C O_{3}, C O_{2}

H_{2} O .

What is the percentage of

N a_{2} C O_{3}

in the given mixture.

Q. A sample contains a mixture of

N a H C O_{3}

N a_{2} C O_{3}

H C l

15.0

g of the sample yielding

11.0

N a C l

. What percent of the sample is

N a_{2} C O_{3}

?
Reactions are:

N a_{2} C O_{3} + 2 H C l \to 2 N a C l + C O_{2} + H_{2} O

N a H C O_{3} + H C l \to N a C l + C O_{2} + H_{2} O

Molecular weight of

N a C l

N a H C O_{3}

N a_{2} C O_{3}

58.5

84

106

g/mol respectively.

2.0

g sample containing

{N a}_{2} C O_{3}

N a H C O_{3}

0.248

g when heated to

300

^{o} C

, the temperature at which

N a H C O_{3}

{N a}_{2} C O_{3}, C O_{2}

H_{2} O

%

{N a}_{2} C O_{3}

in the mixture is (as the nearest integer):

On passing $C O_{2}$ , through concentrated solution of $N a_{2} C O_{3}$ gives

$N a_{2} C O_{3} + H_{2} O + C O_{2} \to$ ___

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