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How do you make carbon dioxide-free water?
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Murphy Smith
How do you make carbon dioxide-free water?
Purge it with an inactive gas like argon. Use a glass tube fused to a porous plug at one end. Insert the plug in the water. Connect the other end of the tube to a source of gas.
Distilled water containing an appreciable amount of CO2 will be slightly acid (~ pH 5 in my experience) because of the formation of carbonic acid. (CO2 is an acid anhydride that turns into an acid when mixed with water.) Therefore, you can measure the pH of the water to serve as an detector of CO2. When the pH is neutral, seal the bottle with an air-proof cap. Argon is better than helium or any light gas because it will remain in the bottle when you remove the sparging tube before capping the bottle, and will serve as a buffer against other gases penetrating the liquid in storage.
Purge it with an inactive gas like argon. Use a glass tube fused to a porous plug at one end. Insert the plug in the water. Connect the other end of the tube to a source of gas.
Distilled water containing an appreciable amount of CO2 will be slightly acid (~ pH 5 in my experience) because of the formation of carbonic acid. (CO2 is an acid anhydride that turns into an acid when mixed with water.) Therefore, you can measure the pH of the water to serve as an detector of CO2. When the pH is neutral, seal the bottle with an air-proof cap. Argon is better than helium or any light gas because it will remain in the bottle when you remove the sparging tube before capping the bottle, and will serve as a buffer against other gases penetrating the liquid in storage.
Purge it with an inactive gas like argon. Use a glass tube fused to a porous plug at one end. Insert the plug in the water. Connect the other end of the tube to a source of gas.
Distilled water containing an appreciable amount of CO2 will be slightly acid (~ pH 5 in my experience) because of the formation of carbonic acid. (CO2 is an acid anhydride that turns into an acid when mixed with water.) Therefore, you can measure the pH of the water to serve as an detector of CO2. When the pH is neutral, seal the bottle with an air-proof cap. Argon is better than helium or any light gas because it will remain in the bottle when you remove the sparging tube before capping the bottle, and will serve as a buffer against other gases penetrating the liquid in storage.
Purge it with an inactive gas like argon. Use a glass tube fused to a porous plug at one end. Insert the plug in the water. Connect the other end of the tube to a source of gas.
Distilled water containing an appreciable amount of CO2 will be slightly acid (~ pH 5 in my experience) because of the formation of carbonic acid. (CO2 is an acid anhydride that turns into an acid when mixed with water.) Therefore, you can measure the pH of the water to serve as an detector of CO2. When the pH is neutral, seal the bottle with an air-proof cap. Argon is better than helium or any light gas because it will remain in the bottle when you remove the sparging tube before capping the bottle, and will serve as a buffer against other gases penetrating the liquid in storage.
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Boil it. But when it cools down again, atmospheric CO2 will dissolve back into the water. Gases dissolve into water under atmospheric pressure.
Boil it. But when it cools down again, atmospheric CO2 will dissolve back into the water. Gases dissolve into water under atmospheric pressure.
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