﻿ 20 mL of a solution containing Na2CO3 and NaHCO3 requires 10 mL of 0.1 N H2SO4 for neutralization using phenolphthalein as an indicator. Methyl orange is then added when a further 10 mL of 0.2 N H2SO4 is required. Molar concentration of Na2CO3 and NaHCO3 in the solution respectively are : Kaysons Education

# 20 ML Of A Solution Containing Na2CO3 and NaHCO3 requires 10 ML Of 0.1 N H2SO4 for Neutralization Using Phenolphthalein As An Indicator. Methyl Orange Is Then Added When A Further 10 ML Of 0.2 N H2SO4 is Required. Molar Concentration Of Na2CO3 and NaHCO3 in The Solution Respectively Are

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## Question

### Solution

Correct option is

0.05 and 0.05 M

Phenolphthalein end point :

Eq. mass of Na2CO3 = molar mass

Methyl orange end point :

Then, 20×M(NaHCO3) = (20 – 10)×0.1

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