2006-08-11 22:09:25 · 5 answers · asked by drabiri aliakbar 1 in Science & Mathematics ➔ Chemistry
Negative pH just means very concentrated H+, more than 1 M in fact, so it's quite feasible.
However, in such solutions you move away from ideal solution behaviour. See e.g. http://en.wikipedia.org/wiki/PH
2006-08-11 22:59:16 · answer #1 · answered by Stephan B 5 · 0⤊ 0⤋
pH=-log[H+]
At room temperature the range is 0-14. At higher temperatures the upper limit is lower (e.g. 13) because the ionization equilibrium constant of water changes but the lower is always 0.
pH is a way to measure the concentration of H+ in dilute solutions in water.
pH=0 means that [H+]= 1M which is already not very dilute
pH would be negative for [H+]> 1M which is not at all dilute and there is no point in trying to determine the pH of such a solution.
There would be no chemical indicator to measure so high [H+] and also the pH-meter would fail. If you see negative values with a pH-meter you can't trust them and need to calibrate again with fresh solutions. I wouldn't dip though the electrode in concentrated acid... so don't even think of doing that.
2006-08-12 05:30:43 · answer #2 · answered by bellerophon 6 · 0⤊ 0⤋
pH or potential of hydrogen is the negative logarithm to the base 10 of the hydrogen ion concentration in moles per liter. The value ranges from 1 to 14. There is no such thing as negative pH.
2006-08-12 05:15:40 · answer #3 · answered by ATIJRTX 4 · 0⤊ 1⤋
NO !!! PH is just between 0 and 14. 0 to 7 Acid and 7 to 14 is...
2006-08-12 05:32:15 · answer #4 · answered by soren 1 · 0⤊ 0⤋
Stephan B wins.
2006-08-12 08:30:26 · answer #5 · answered by Bullwinkle Moose 6 · 0⤊ 0⤋