How does acid or base affect pH of distilled water?

Answer 1

In the process of distillation, during condesation the temperature of water decreases Hence absorption of CO2 takes place and some H2CO3 is formed. This is an acid (though very weakly) so water turns acidic. Double distillation enhance this so theoritical pH is 7.0 but practically less than 7.0 (6.2 to 6.8)

Answer 2

Freshly distilled water WOULD INITIALLY have a pH of 7.0, but as soon as it is exposed to the air, which has CO2 in it, it begins to combine with the CO2 present in the atmosphere and after time, produces a mildly form of acid, carbonic acid. My daughter did a science fair project on why distilled water should NOT be used as a a control (ie, pH of 7.0) for exactly this reason.

Answer 3

Adding an acid to distilled water will lower the pH, making it more acidic. Conversely, adding a base to distilled water will raise the pH, making it more alkaline. pH measures the concentration of hydrogen ions in a solution, so adding acid increases these ions, while adding a base decreases them.

Answer 4

Because water absorb carbon dioxide from the atmosphere.
It's not ... unless its not pure.

Answer 5

pH of distilled water is pH7. Adding acid will make the pH drop <7. Adding base will make the pH rise >7

Answer 6

Water reacts with carbon dioxide in the air to form small amounts of carbonic acid.

Answer 7

The ultrapure water is neutral; but the absorption of carbon dioxide from the atmosphere is very possible.

Answer 8

atmospheric intrusion of carbon dioxide