2006-10-26 07:46:05 · 5 answers · asked by - 3 in Science & Mathematics ➔ Chemistry
The reason why purely distilled water has a lower pH is because it absorbs atmospheric carbon dioxide:
2 H2O + CO2 --> H2O + H2CO3 (carbonic acid)
This usually achieves a balance of pH 5.8 in a couple hours. And, of course, the only way to stop it is to never allow the distilled water to come in contact with the atmosphere.
2006-10-26 07:52:25 · answer #1 · answered by Doctor Why 7 · 2⤊ 0⤋
There is CO2 in the air, and it will tend to be dissolved in the water. That CO2 will combine with water and produce carbonic acid, hence the water will become slightly acidic over time, with a lowering of the pH value.
2006-10-26 14:49:22 · answer #2 · answered by Vincent G 7 · 5⤊ 0⤋
Ph of 7 is salt water
2006-10-26 14:52:31 · answer #3 · answered by JOHNNIE B 7 · 0⤊ 3⤋
Fermi of Borg has it down. Did you mean "de-ionized" water? This is one step past distilled. It is extremely active and corrosive.
2006-10-26 15:10:34 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Dunno, news to me, but I drink bottled water, so keep me posted. Interesting......
2006-10-26 14:47:41 · answer #5 · answered by jirstan2 4 · 0⤊ 2⤋