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in ph scale,why the number is limited means from 0 to14?

in ph scale,why the number is limited means from 0 to14?

Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
The pH scale is limited on the low end by the highest concentration (activity) of [H+] in solution. On a practical level this is something like 20M or pH=-log[H+]=log[20]=-1.3. The upper end of the pH scale is limited by the lowest concentration (activity) of [H+] in solution. In aqueous solution the autoionization of water limits this value according to 14=pOH+pH. For example the solubility of sodium hydroxide in water is about 111g/100mL or about 27M. pOH=-1.4 so pH=15.4. Note that the pH of non-aqueous solutions can exceed the -1.3–15.4 range I illustrated. On a practical level it is not straightforward to measure a pH outside the 1-13 range. Certainly a standard pH electrode will not be accurate.

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