Carbonic Acid And How Temperature Affect Ph

Check out my wiki for How Temperature Affects pH prior to reading this.
I wanted to give some proof of how higher temperatures cause there to be less carbon dioxide/carbonic acid in the water and therefore a lower pH.

Note that this test is done with freshwater. I could have done it with saltwater, but for all intents and purposes, I felt that using pure water would be better.

So here I'm testing my water. API freshwater test kit.

Here is a picture of my RO water. I theorize that it is acidic due to being aerated and full of carbonic acid. I was correct. The pH was quite low.


Here I am filling a pot with RO water for boiling.


Full


On the stove


It's at a boil. If I am right, the temperature has caused the CO2 to precipitate out of the solution because it is not soluble at this temperature.


Now the water is in the tube (boiling I might add). I burnt my fingers for you guys. As you can see the pH is very high. I can attribute that to the fact that there is a small amount of hydrogen ions in it.


Here it is cooled down.


You will notice that it is exactly the same BUT now CO2 is soluble. The easiest way to incorporate it is to shake the tube.



Hopefully that video worked. Anyway, here it is back to its normal pH.


Tell me what you think. If you have questions even after reading this thread, http://forums.saltwaterfish.com/vb/s...ure-Affects-pH, please feel free to ask!