pH scale is from 1 to 14 (not 15)
In theory any pH is possible, especially at elevated temperatures where pure water decreases in pH because of increased ionisation (but it is still neutral, neither acidic nor alkaline). However, does anything dissolve at sufficiently high concentration, and ionise sufficiently at that concentration, to achieve any given pH? In practice there are limitations. At pH 15, hydrogen ion concentration is 10^-15. That makes hydroxide ion concentration 10^1 - 10M sodium hydroxide in theory would have a pH of 15.
pKa= pH - log(A/HA) to clarify -log is subtract log E.g A buffer is prepared by adding .15 M of NaOH and .1 of a weak acid, HA. If the pH of the buffer is 8.15, what is the pKa of the acid? pH= 8.15 - log .15/.1 = 7.97
Practically pH of 14 or 15 is the highest base value reachable, due to limits of max. concentration.
Practically pH of 14 or 15 is the highest base value reachable, due to limits of max. concentration.
15 pH
Phosphorus
pH scale is from 1 to 14 (not 15)
There are no intervals in pH: it is a continuous property, like concentrationbut it has practical limits of about -1 < pH < 15
In theory any pH is possible, especially at elevated temperatures where pure water decreases in pH because of increased ionisation (but it is still neutral, neither acidic nor alkaline). However, does anything dissolve at sufficiently high concentration, and ionise sufficiently at that concentration, to achieve any given pH? In practice there are limitations. At pH 15, hydrogen ion concentration is 10^-15. That makes hydroxide ion concentration 10^1 - 10M sodium hydroxide in theory would have a pH of 15.
pKa= pH - log(A/HA) to clarify -log is subtract log E.g A buffer is prepared by adding .15 M of NaOH and .1 of a weak acid, HA. If the pH of the buffer is 8.15, what is the pKa of the acid? pH= 8.15 - log .15/.1 = 7.97
Ethanol is basic, ph=15 (I think)
Practically pH of 14 or 15 is the highest base value reachable, due to limits of max. concentration.
This is only a convention.
there is no logical reason to believe that "acetylsalicyclic acid" would have a pH of 15...this would be a base.
Practically pH of 14 or 15 is the highest base value reachable, due to limits of max. concentration.
The highest pH on the scale is 14. But pH over 14 is also possible: for example a sample of 1o M sodium hydroxide solution has a pH of 15.