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Standard XII

Chemistry

Types of Redox Reactions

20 mL of 0.1 ...

Question

$20 mL$ of $0.1 M$ solution of compound $N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 2 H_{2} O$ is titrated against $0.05 M H C l$ , $x mL$ of $H C l$ is used when phenolphthalein is used as an indicator and $y mL$ of $H C l$ is used when methyl orange is the indicator in two separate titrations. Hence $(y - x)$ is:

40 mL

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80 mL

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120 mL

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None of these

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Solution

The correct option is B $80 mL$
When phenolphthalein is used as an indicator:
Only one part of base reacts
By using formula,
$m e q . of acid used = m e q . base$
$V \times M \times n = V \times M \times n$
Where,
$M = M o l a r i t y V = V o l u m e n = n - f a c t o r$
$0.05 x \times 1 = 20 \times 0.1 \times 1; x = 40 mL$
When methyl orange is used as an indicator:
All parts of base reacts
By using formula,
$m e q . of acid used = m e q . base$
$0.05 y \times 1 = (20 \times 0.1 \times 1) + (20 \times 0.1 \times 2)$
$y = 120 mL$
$∴ y - x = 80 mL$

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Similar questions

20 mL

0.1 M

solution of compound

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

is titrated against

0.05 M H C l

x mL

H C l

is used when phenolphthalein is used as an indicator and

y mL

H C l

is used when methyl orange is the indicator in two separate titrations. Hence

(y - x)

is:

40

ml of

0.05 M

solution of sesqui-carbonate

(N a_{2} C O_{3} . N a H C O_{3} .2 H_{2} O)

is titrated against

0.05 M

H C l

x

mL of

H C l

is used when phenolphthalein is the indicator and

y

mL of

H C l

is used when methyl orange is the indicator in two separate titrations. Hence,

(y - x)

is :

40 m L

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

(sesquicarbonate) is titrated against

0.05 M H C l . x m L

H C l

is used when phenolphthalein is the indicator and

y m L H C l

is used when methyl orange is the indicator in two separate titrations, hence

(y - x)

is________.

Q. Given two mixtures: (A)

N a O H

and

N a_{2} C O_{3}

and

(B)

N a H C O_{3}

and

N a_{2} C O_{3}

100

mL of mixture (A) required

a

mL and

b

mL of

1 M

H C l

in separate titration using phenolphthalein and methyl orange indicators respectively while

100

mL of mixture (B) required

x

mL and

y

mL of same

H C l

solution is separate titration using the same indicators.

Q. In the mixture of

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

, volume of

H C l

required is

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20 mL of 0.1 M solution of compound Na2CO3⋅NaHCO3⋅2H2O is titrated against 0.05 M HCl, x mL of HCl is used when phenolphthalein is used as an indicator and y mL of HCl is used when methyl orange is the indicator in two separate titrations. Hence (y−x) is: