How to find the concentration of CO2 in 1M NAOH solution?

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The discussion centers on analyzing liquid samples after conducting an absorption experiment using 1M NaOH to capture CO2 from the air. The primary method involves measuring the concentration of NaOH before and after the experiment, with the difference indicating the concentration of CO2 absorbed. While this approach is valid, it presents challenges due to the presence of Na2CO3 and unreacted NaOH in the outlet solution. The titration of the outlet solution against HCl is complicated by the reaction of Na2CO3 with HCl, which can regenerate NaOH and lead to misleading results, showing no significant difference in concentration. The importance of selecting the correct indicator for titration is emphasized to improve accuracy in the analysis.
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I done the absorption experiment i.e absorption of CO2 from air using 1M NaOH .Can anyone please tell how to analyse the Liquid sample after absorption.

I found the concentration of NaOH after and before the experiment,difference in Concentration gives the concentration of CO2.is it the reight approach.
Any suggestion is appreciated..
 
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Pollyannaism said:
I found the concentration of NaOH after

How?

This is not a wrong approach, it is just a tricky problem. Compare Warder titration.
 
Thank you for replying..

I directly titrate the NaOH solution at inlet and also liquid solution from the column( outlet solution )against the HCl to find the concentration.My doubt is that when I tirate NaOH solution of the outlet ( contains Na2CO3 + unreacted NaOH) against HCl ,Na2cO3 reacts with Hcl to form NaOH again and CO2 will bubble out.So after doing the titration I am getting almost the same concentration(no significant difference)in both the solution.
 
Have you read the linked page? It is likely a matter of choosing correct indicator.
 

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