Why is it necessary to rid distilled water of CO2 when doing a titration?

this is for standardization of NaOH. Thanks!

CO2 makes the water in to a mild acid which will affect the results. EDIT Bobby CO2 gets into water from the air.

How did the CO2 get in there? If there is CO2, it would make the water slightly acidic, which would affect the titration.

So the CO2 gas does not react with the other components in the titration.

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