
Citric acid powder, MF: 192.12, MW: C₆H₈O₇, is a tricarboxylic organic compound characterized by a strong sour taste, high water solubility, acidity, chelating properties, and antioxidant synergistic effects. It appears as a white powder, odorless with a strong sour taste, readily soluble in water and ethanol, and soluble in ether. Naturally occurring in citrus fruits (lemons, oranges) and strawberries, it is one of the most widely used organic acids in industry and daily life.
| Item | Specification |
| Melting point | 153–159°C (lit.) mmHg |
| Boiling point | 310°C (decomp) |
| Bulk density | 560 kg/m³ |
| Density | 1.67 g/cm³ at 20°C |
| Vapor density | 7.26 (vs air) |
| Vapor pressure | <0.1 hPa (20°C) |
| Refractive Index | 1.493–1.509 |
| Flash Point | 100°C |
| Acidity Constant (pKa) | 3.14 (at 20°C) |
| Solubility | Very soluble in water, soluble in ethanol, slightly soluble in diethyl ether, insoluble in benzene. |
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