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Yes, it is indeed possible to have pH outside of the range from 0 to 14. For example, if you had a solution of 10M HCl (a strong acid), you would find the pH = -log(H+) to be -1. Of course, this would be a tremendously strong acid solution. Likewise for very strong bases, if you had a solution of 10M NaOH (a strong base) you'd find the pOH = -log(OH-) to be -1 and thus the pH to be 15.
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