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Why is solution of potassium hydroxide u...

Why is solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

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Carbon dioxide is acidic and it reacts with strong base KOH to form potassium carbonate.
`2 KOH + CO_2 to K_2 CO_3`
This results in increase in mass of potassium hydroxide. From the increase in mass of `CO_2` produced, the amount of carbon in the organic compound can be calculated by using the formula:
`% "Carbon" = (12)/( 44) xx (" Mass of" CO_2 "produced" )/( "Mass of substance") xx 100`
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