Ph is always positive. But we put 2 moles of HCl in one liter of water and assume that all the acid gets dissolved, we get the Ph = -log [2] which is negative.
2007-03-17 23:05:26 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
it is theoretically correct
As pH = log1/[H+] = -log[H+] and the solution is 2M
you find pH =-log 2 =-0.3
The problem in practice is that [H+] does not represent the concentration but the activity of the [H+] ion (activity = concentration*coefficient of activity). The coefficient of activity is lower than 1 than the solution is concentrated so the pH must be corrected
2007-03-17 23:38:09 · answer #1 · answered by maussy 7 · 1⤊ 0⤋
first you have to find the concentration of HCl
M=moles/liters
M=2/1
M=1
pH=-log([H+])
since all of the HCl will dissociate, you have the same concentration of H+ as you do for HCl
so pH=-log(2)
pH=-.301
it is negative because that is how pH is measure thoratically
practically, that would not be the answer
2007-03-18 03:36:15 · answer #2 · answered by blueboy3056 3 · 0⤊ 0⤋
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2016-05-15 22:36:49 · answer #3 · answered by Anonymous · 0⤊ 0⤋