CO2 free distilled water

Dear forum members,

For preparation of pH buffer solutions from readymade pH buffer tablets, CO2 free distilled water should be used. Is there any test to confirm the water is CO2 free? Like if any kit available to test CO2 free distilled water etc.
Kindly suggest.

Aparna Jagadale

CO2 Reacts with water to form a weak acid H3CO2 , which lowers your pH of water. pH test is useful.

Conductivity test also will be helpful. pure CO2 free water has 18 mhO resistivity. if this is contaminated by CO2. resistivity decreases. conductivity increases.

I hope this helps.

Bujji Reddy.