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Physical Properties of HCl

3.65 gm equim...

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3.65 gm equimolar mixture of NaOH and Na_2 CO_3, is titrated against 0.1 M HCl using phenolphthalein as an indicator, V1 mL of acid was required to reach end point. In another experiment 3.65 gm of same mixture is titrated against 0.2 M HCl using methylorange as an indicator, V_{2 }mL of acid was required to reach end point. V1 + V2 is :

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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

H C l

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

N a_{2} C O_{3}

in the mixture is ______. (Rounded off to the nearest integer)

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}

in the mixture.

Q. 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 :

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.

0.6234

g sample that might contain

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

or a mixture of

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

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

is titrated with

0.1062 M H C l

by two-indicator method. It is found that

40.38

mL of the acid is required to reach the phenolphthalein end-point. Methyl orange is then added to the solution and the titration continued using an additional

12.83

mL of the acid. Thus, the sample contained :

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