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Solutions can fall outside the 0-14 range. Dr. Lavelle mentioned "superacids" which have a H3O+ concentration > 1x10^0 M and thus would have a negative pH. However, these are uncommon, especially in biological systems. I'm sure the same is true for bases.
The 0-14 scale is most of the time all you will have to worry about, but don't be alarmed if your calculations give you a number slightly below 0 or slightly above 14. It is possible in extremely strong acids / bases, but is rare.
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