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Reducing Nature of Alkali Metals

40. A 2g samp...

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40. A 2g sample containing Na2CO3 and NaHCO3 loses 0.248g when heated to 300^° c,the temperature at which NaHCO3 decomposes to Na2CO3,CO2 AND H2O.what is the precentage of Na2CO3 in the given mixture?

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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.

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):

Q. A 2.00 g. of sample containing

N a_{2} C O_{3}

N a H C O_{3}

loses 0.248 g when heated to

300^{o} C

, the temperature at which

N a H C O_{3}

decomposes .Find % composition of

N a_{2} C O_{3}

in the 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.

100 g

N a H C O_{3}

was heated until

11.2 L

C O_{2} (g)

was collected at

S T P

. What percentage of the

N a H C O_{3}

had decomposed?

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

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