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A mixutre solution of KOH and Na2CO3 req...

A mixutre solution of KOH and `Na_2CO_3` requires 15 " mL of " `(N)/(20)` HCl when titrated with phenolphthalein as indicator.But the same amoound of the solutions when titrated with methyl orange as indicator requires 25 " mL of " the same acid. Calculate the amount of KOH present in the solution.

A

0.014 g

B

0.14 g

C

0.028 g

D

1.4 g

Text Solution

Verified by Experts

The correct Answer is:
A
(a). `underset((x mmol))(KOH)+underset((y mmol))(Na_(2)CO_(3)`
(i). `(x xx1)+(yxx2)xx(1)/(2)=(1)/(20)xx15`
(ii). (x xx1)+(yxx2)=(1)/(20)xx25impliesy=0.5` and `x=0.25`
`impliesKOH-=x` mmoles `=0.25xx10^(-3)xx56g=0.014g`
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