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Anurag Kishore Grade: 12

Sir please reply my previous questions


Can pH be negative or greater than 14?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points

Dear Anurag

the pH scale, while often taught that it runs from 1 to 14, or sometimes 0 to 14, can actually assume any value. I imagine there are physical limits but certainly negative pH or pH greater than 14 is possible, just not very common. If the concentration of protons is 10 molor  the pH would be -1.

One comment - pH, at least when measured, is an index of protonactivity  not proton concentration. Its one of the few chemical parameters where activity can be measured directly.

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7 years ago
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