I was asked to include Stewart acid-base chemistry into a lecture I have and then I became very confused when I tried to read about it. It is there stated that it is the ion gap between positive and negative ions that creates pH changes by interacting with water. A negative value will for example lead to that H+ is donated from water to neutralize the charge difference. What I do not understand here is that it is impossible to take H+ from water without creating OH- at the same time. This would violate the law pH+pOH=14 and it will also not help to neutralize the charge difference. Is there anyone else that understands where OH- go in this case? Is it going to neighboring tissues?
pH +pOH can be different at various temperatures. The sum is equal to 14 in chemically pure water at 25 oC.
Thanks a lot for the explanation, but still there is a problem that it does not help to minimize the ion gap if both one positive ion (H+) and one negative ion (OH-) are produced.
I would say they are two different method to describe the electro-neutrality/acidity-basicity and thus differences in them would not violate any law.
I found this useful http://www.acidbase.org/hbdrgs.pdf
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