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Atomic Mass

200 mL of a s...

Question

200 mL of a solution mixture $N a O H$ and $N a_{2} C O_{3}$ was first titrated with phenolphthalein and N/10 HCl 17.5 mL of HCl was required for the end point. After this methyl orange was added and 2.5 mL of same HCl was again required for next end point. Find out the mass of NaOH and $N a_{2} C O_{3}$ .

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Solution

$200 m l$ mixture of $N a O H$ & ${N a}_{2} {C O}_{3}$
Let $N a O H$ be $x$ moles, ${N a}_{2} {C O}_{3}$ be $y$ moles with $h p h$ indicator
we detect
$x + y$ moles $= \frac{1}{10} \times \frac{17.5}{1000} = 1.75$ millimoles
next with methyorange
$y$ moles $= \frac{1}{10} \times \frac{2.5}{100} = 0.75$ millimoles
$\Rightarrow x = 1.5$ millimoles
$y = 0.25$ millimoles
weight of $N a O H = 1.5 \times 40 \times 10^{- 3} = 60 m g$
weight of ${N a}_{2} {C O}_{3} = 0.25 \times 106 {\times 10}^{- 3} = 26.5 m g$

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200

N a O H

N a_{2} C O_{3}

was first titrated with phenolpthalein and

17.5

H C l

with normality 0.10

N

was required for end point. After this, methyl orange was added and

2.5

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was again required for next end point. Find out the amounts of

N a O H

N a_{2} C O_{3}

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Q. 200 mL solution of

N a O H

N a_{2} C O_{3}

was first titrated with N/10

H C l

H P h

17.5 mL is required to end point. After this

M e O H

was added and 2.5 mL of same

H C l

is required. The amount of

N a O H

in mixture is :

0.4 g

N a O H

N a_{2} C O_{3}

and some inert impurities were first titrated with

\frac{N}{10} H C l

using phenolphthalein as an indicator.

17.5 m L

H C l

was required at the end point. After this methyl orange was added and titrated.

1.5 m L

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was required for the next end point. The weight percentage of

N a_{2} C O_{3}

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500 m L

of a solution of

C a C O_{3}

N a O H

was first titrated with

\frac{N}{10} H C l

using phenolphthalein indicator.

18.5 m L

H C l

was required for the end point. After that methyl orange indicator was used and

2.5 m L

H C l

was required for the next end point. Find out the mass of

C a C O_{3}

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0.2 g m

of solution of mixture of

N a O H

N a_{2} C O_{3}

and inert impurities was first titrated with phenolphthalein and

N / 10

H C l

17.5 m l

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was required at the endpoint. After this methyl orange was added and

2.5 m l

H C l

was again required for next endpoint. Find out percentage of

N a O H

N a_{2} C O_{3}

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