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83 No. 10 October 2006 ⢠Journal of Chemical Education 1465. Negative pH Does Exist. pH is commonly used as a measure of the hydronium ion concentration ...
Chemical Education Today
Letters Negative pH Does Exist
A
pH scale
pH is commonly used as a measure of the hydronium ion concentration in chemistry, biochemistry, soil science, wine science, and other fields: pH = ᎑log10[H3O+(aq)]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
increasing basicity
increasing acidity
(1)
The logarithmic pH scale of eq 1 is open-ended, allowing for pH values below 0 or above 14. Nevertheless, there is much confusion about the permissible range of the pH scale (e.g., 1–16 ). The misconception that pH lies between 0 and 14 has been perpetuated in popular-science books (1–3), textbooks (4–8), revision guides (9), and reference books (10–16). Although many chemistry texts state or infer that negative pH values are possible, typically no examples are given. This may be because negative pH values are difficult to measure experimentally (17, 18) and there has been a lack of suitable buffer standards for pH
