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Volume of Gases and Number of Moles

A mixture of ...

Question

A mixture of NaOH and $N a_{2} C O_{3}$ required 25mL of 0.21 m HCl using phenolphthalein as the indicator. However, the same amount of the mixture required 30 mL of 0.1 M HCl when methyl orange was used as the indicator. The molar ratio of NaOH and $N a_{2} C O_{3}$ in the mixture was :

A

2 : 1

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B

1 : 2

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C

4 ; 1

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D

1 : 4

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Solution

The correct option is C 2 : 1
$x$ moles of $N a O H$
$y$ moles of ${N a}_{2} {C O}_{3}$
with hph, $x + y$ moles reacted
0.21 molar $\Rightarrow$ molarity conversion
density data missing!

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Similar questions

25 m L

of a mixture of

N a O H

N a_{2} C O_{3}

when titrated with

N / 10 H C l

using phenolphthalein indicator required

25 m L H C l

. The same volume of mixture when titrated with

N / 10 H C l

using methyl orange indicator required

30 m L

H C l

. Calculate the amount of

N a_{2} C O_{3}

N a O H

in one litre of this mixture.

1

N a_{2} C O_{3}

N a O H

H_{2} O

100

mL of this solution required

20

0.4 M

H C l

in the presence of phenolphthalein. However, another

100

mL sample of the same solution required

25

mL of the same acid in the presence of methyl orange as indicator. What is the molar ratio of

N a_{2} C O_{3}

N a O H

in the original mixture?

Q. 1 L solution of

N a_{2} C O_{3}

N a O H

H_{2} O

100

mL of this solution required

20

0.4 M

H C l

in the presence of phenolphthalein. However, another

100

mL sample of the same solution required

25

mL of the same acid in the presence of methyl orange as an indicator.

If molar ratio of

N a_{2} C O_{3}

N a O H

in the original mixture is

\frac{x}{y}

x + y

Q. A solution contains a mixture of

N a_{2} C O_{3}

N a O H .

Using phenolphthalein as indicator

35 m L

of mixture required

20 m L

0.80 N H C l

for the end point. With methyl orange,

35 m L

of solution required

37.5 m L

H C l

for the end point. What is the weight of

N a_{2} C O_{3}

N a O H

respectively in the mixture?

25 m L

of a mixture of

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

, when titrated with

\frac{N}{10} H C l

using phenolphthalein indicator required

25 m L H C l

to decolourise phenolphthalein. At this stage, methyl orange was added and the addition of acid was continued. The second endpoint was reached after further addition of

5 m L

of the acid. Calculate the amount of

N a_{2} C O_{3}

N a O H

in one litre of the solution.

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