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Stoichiometry

N a 2 CO 3 an...

Question

$N a_{2} C O_{3}$ and $N a H C O_{3}$ may be distinguished by treating their aq. solution with

A

Litmus solution

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B

Dil.acetic acid

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C

Methyl orange

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D

Phenolphthalein

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Solution

The correct option is D
Phenolphthalein

$N a_{2} C O_{3}$ is stronger base than $N a H C O_{3}$

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Similar questions

N a_{2} C O_{3}

N a H C O_{3}

may be distinguished by treating their aqueous solutions with:

The indicators which turn red in acid solution are :

(a) turmeric and litmus

(b) phenolphthalein and methyl orange

(c) litmus and methyl orange

(d) phenolphthalein and litmus

Q. A solution contains

N a_{2} C O_{3}

N a H C O_{3}, 10 m L

of this solution required

2.5 m L

0.1 M H_{2} S O_{4}

for neutralisation using phenolphthalein indicator. Methyl orange is added after first end point, further titration required

2.5 m L

0.2 M H_{2} S O_{4}

. The amount of

N a_{2} C O_{3}

N a H C O_{3}

1

litre of the solution is:

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

20 m l

H C l

using phenolphthalein as indicator and

35 m l

more required if methyl orange is used as indicator. Then molar ratio of

N a H C O_{3}

N a_{2} C O_{3}

50 m L

of a solution of

N a_{2} C O_{3}

N a H C O_{3}

17.5 m L

0.1 M H_{2} S O_{4}

for neutralisation using phenolphthalein as indicator. Methyl orange is then added when further

25 m L

0.2 M H_{2} S O_{4}

was required. Calculate the weight of

N a_{2} C O_{3}

N a H C O_{3}

respectively in the solution.

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