pH Concentrations Scale
| Concentrations of Hydrogen ions (H3O+) compared to distilled water | pH | Solutions that typically have this pH | H3O+ | OH- |
| 10,000,000 | pH = 0 | battery acid | 1 x 100 | 1 x 10-14 |
| 1,000,000 | pH = 1 | stomach acid | 1 x 10-1 | 1 x 10-13 |
| 100,000 | pH = 2 | lemon juice, vinegar | 1 x 10-2 | 1 x 10-12 |
| 10,000 | pH = 3 | grapefruit, orange juice, soda | 1 x 10-3 | 1 x 10-11 |
| 1,000 | pH = 4 | tomato juice, acid rain | 1 x 10-4 | 1 x 10-10 |
| 100 | pH = 5 | black coffee, rain water | 1 x 10-5 | 1 x 10-9 |
| 10 | pH = 6 | urine, saliva | 1 x 10-6 | 1 x 10-8 |
| 1 | pH = 7 | "pure" water | 1 x 10-7 | 1 x 10-7 |
| 1/10 | pH = 8 | sea water | 1 x 10-8 | 1 x 10-6 |
| 1/100 | pH = 9 | baking soda | 1 x 10-9 | 1 x 10-5 |
| 1/1,000 | pH = 10 | milk of magnesia | 1 x 10-10 | 1 x 10-4 |
| 1/10,000 | pH = 11 | ammonia | 1 x 10-11 | 1 x 10-3 |
| 1/100,000 | pH =12 | soapy water, bleach | 1 x 10-12 | 1 x 10-2 |
| 1/1,000,000 | pH = 13 | oven cleaner | 1 x 10-13 | 1 x 10-1 |
| 1/10,000,000 | pH = 14 | liquid drain cleaner | 1 x 10-14 | 1 x 100 |