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Yes. A very strong acid - say 10M HCl would have a pH of -log10 [10] = -1.

1M HCl has a pH of zero. Strengths of acid betwen 1 and 10Molar woul be less than zero pH. However, the scale was designed to be practical and most pHs are indeed 0-14.

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Q: Why is the range of pH 0-14 can pH be below or beyond this range?
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