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The pH of fumaric acid and its sodium salts at different concentrations.
| Concentration of solute | Fumaric acid | Monosodium fumarate | Sodium fumarate |
|---|---|---|---|
| 0.05% | 2.96 | 3.81 | 7.54 |
| 0.2% | 2.76 | 3.67 | 7.22 |
| 0.4% | 2.55 | 3.68 | 7.75 |
| 1% | 2.5 | 3.65 | 7.76 |
| 2% | 2.48 | 3.6 | 7.92 |
Fumaric acid, monosodium fumarate, and sodium fumarate solutions were made by suspension in distilled water at concentrations of 0.05, 0.2, 0.4, 1, and 2%.
