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Only a super acid or a super base would make the H+ concentration exceed .1M or less than 10^-14M, which correspond to ph 1 and 14. Because super acids and bases aren't as common as regular ones, values outside the regular pH range are rare.
n short, it is possible to have pH outside of this range but it will be extremely concentrated, resulting in a virtually meaningless pH value. The exception of pH falling in the 1-14 scale can be caused by lowering the concentration of H20 (if not obeying the assumption that water does not have a varying concentration) can cause the H+ concentration to decrease as the acid is added. Hope this makes sense!
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