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s- Block Elements

In United Sta...

Question

In United States, sodium carbonate is obtained from naturally occurring deposits of the mineral trona. The chemical formula of trona is :

A

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

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B

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

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C

N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 4 H_{2} O

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D

N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 6 H_{2} O

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Solution

The correct option is A $N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 2 H_{2} O$
Trona (trisodium hydrogendicarbonate dihydrate also sodium sesguicarbonate dihydrate); $N a_{3} (C O_{3}) (H C O_{3}) .2 H_{2} O$ which can be written as $N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 2 H_{2} O$ .
Hence option A is correct.

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Similar questions

Q. What is obtained when

{NaHCO}_{3}

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

Q. The valency factor of

N a_{2} C O_{3}

in the given reaction is

N a_{2} C O_{3} B a s e + H C l A c i d \to N a H C O_{3} + N a C l

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.

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.

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