This page provides supplementary chemical data on acetic acid.
Material Safety Data Sheet
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source and follow its directions. PTCL Safety web site Science Stuff
Structure and properties
Structure and properties Dielectric constant, εr 6.15 ε0 at 20 °C Surface tension 26.6 dyn/cm at 30 °C ViscosityLange's Handbook of Chemistry, 10th ed. pp 1669-1674 1.222 mPa·s at 20 °C 1.0396 mPa·s at 30 °C 0.7956 mPa·s at 50 °C 0.4244 mPa·s at 110 °C
Thermodynamic properties
Phase behavior Triple point 289.8 K (16.7 °C), ? Pa Eutectic point with water –26.7 °C Std entropy changeof fusionΔfusSo 40.5 J/(mol·K) Liquid properties Standard molar entropySoliquid 158.0 J/(mol K) Gas properties Std enthalpy changeof formation ΔfHogas –438.1 kJ/mol Standard molar entropySogas 282.84 J/(mol K) Heat capacity cp 63.4 J/(mol K) van der Waals' constantsLange's Handbook of Chemistry 10th ed, pp 1522-1524 a = 1782.3 L2 kPa/mol2 b = 0.1068 liter per mole
Vapor pressure of liquid
P in mm Hg 1 10 40 100 400 760 1520 3800 7600 15200 30400 45600 T in °C –17.2 17.5 43.0 63.0 99.0 118.1 143.5 180.3 214.0 252.0 297.0 —
Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.
Distillation data
Vapor-liquid Equilibrium for Acetic acid/WaterP = 760 mm Hg BPTemp.°C mole % water liquid vapor 116.5 2.2 5.8 114.6 5.4 12.3 113.4 8.6 16.8 113.5 9.9 18.3 113.1 10.1 18.8 110.6 18.9 29.8 107.8 30.3 43.3 106.1 41.3 54.5 104.4 52.2 64.9 103.1 62.4 73.5 102.3 69.6 79.2 101.6 77.8 85.1 100.8 87.6 91.4 100.5 92.3 94.4 100.4 94.5 96.0 100.1 98.5 98.9
Spectral data
UV-Vis λmax 207 nm (gas phase) IR Major absorption bands (liquid film) Wave number transmittance 2937 cm−1 26% 2684 cm−1 41% 2631 cm−1 39% 2569 cm−1 49% 1758 cm−1 19% 1714 cm−1 4% 1617 cm−1 66% 1414 cm−1 20% 1360 cm−1 39% 1294 cm−1 12% 1053 cm−1 67% 1016 cm−1 41% 937 cm−1 35% 892 cm−1 41% 629 cm−1 31% 607 cm−1 49% 481 cm−1 36% 473 cm−1 52% NMR Proton NMR δ CDCl3 2.10 (3H), 11.42 (1H) Carbon-13 NMR δ CDCl3 20.8, 178.1 MS Masses of main fragments 60 (75%), 45 (90%),43 (100%), 42 (13%), 15 (17%)
References