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When CO2 is...

Question

When $C O_{2}$ is continuously passed for a long time into an aqueous solution of sodium carbonate, the formula of the crystalline substance formed is:

A

N a_{2} C O_{3}

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B

N a H C O_{3}

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C

both

N a_{2} C O_{3}

and

N a H C O_{3}

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D

none of the above

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Solution

The correct option is B $N a H C O_{3}$
Sodium carbonate reacts with carbon dioxide in the presence of water to form sodium bicarbonate. When the reaction is continued for a long time, entire sodium carbonate is converted to sodium bicarbonate. ${{N a}_{2} C O}_{3} + H_{2} O + C O_{2} \to {2 N a H C O}_{3}$ .

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Similar questions

C O_{2}

gas along with solid (Y) is obtained when sodium salt (X) is heated. (X) is again obtained when

C O_{2}

gas is passed into aqueous solution of (Y). Identify (X) & (Y) respectively

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

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

6.2

g of a sample containing

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

and non-volatile inert impurity on gentle heating loses

5 %

of its weight due to reaction:

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

. Residue is dissolved in water and formed

100 m L

solution and its

10 m L

portion requires

7.5 m L

0.2 M

aqueous solution of

B a C l_{2}

for complete precipitation of carbonates. Determine weight (in g) of

N a_{2} C O_{3}

in the original sample.

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.

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