Mathematically, pH is defined as:
pH = - log [H+]
Enter into your calculator the following H+ ion concentrations and
see if you arrive at the pH values as indicated.
[H+]
(molarity) | pH |
|---|
| 1 x 10-1 | 1 |
| 1 x 10-3 | 3 |
| 1 x 10-9 | 9 |
| 1 x 10-11 | 11 |
Approximate pH of some common solutions:
| Solution | pH |
|---|
| lemon juice | 2.3 |
| vinegar | 2.5-3.5 |
| coke | 2.0-4.0 |
| blood | 7.4 |
| milk of magnesia | 10.5 |
| household ammonia | 11 |