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Table 4

Physical-chemical characteristics of azelaic acid and pelargonic acid.

Appearance Density Melting Boiling Solubility in pKa
(20 °C) (g/mL) point (°C) point (°C) water (g/l) (25 °C)

Azelaic white solid 1.443 109–111 286 100mmHg 2.14 4.550
acid (AA) and 5.498
Pelargonic clear yellow 0.905 12.4 254.5 0.30 4.95
acid (PA) oily liquid

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