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Engineering ToolBox > Acids - pH Values
pH is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. The acidity of some common acids are shown in the table below.
| Acid | pH |
| Acetic, N | 2.4 |
| Acetic, 0.1N | 2.9 |
| Acetic, 0.01N | 3.4 |
| Alum, 0.1N | 3.2 |
| Arsenious (saturated) | 5.0 |
| Benzoic, 0.01N | 3.1 |
| Boric, 0.1N | 5.2 |
| Carbonic (saturated) | 3.8 |
| Citric, 0.1N | 2.2 |
| Formic, 0.1N | 2.3 |
| Hydrochloric, N | 0.1 |
| Hydrochloric, 0.1N | 1.1 |
| Hydrochloric, 0.01N | 2.0 |
| Hydrocyanic, 0.1N | 5.1 |
| Hydrogen sulfide, 0.1N | 4.1 |
| Lactic, 0.1N | 2.4 |
| Lemon Juice | 2 |
| Malic, 0.1N | 2.2 |
| Orthophosphoric, 0.1N | 1.5 |
| Oxalic, 0.1N | 1.6 |
| Sulfuric, N | 0.3 |
| Sulfuric, 0.1N | 1.2 |
| Sulfuric, 0.01N | 2.1 |
| Sulfurous, 0.1N | 1.5 |
| Stomach Acid | 1 |
| Tartaric, 0.1N | 2.2 |
| Vinegar | 3 |