Acetic acid (data page)

This page provides supplementary chemical data on acetic acid.

Contents

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.

Structure and properties

Structure and properties
Index of refraction, nD 1.3716
Dielectric constant, εr 6.15 ε0 at 20 °C
Bond strength  ?
Bond length  ?
Bond angle  ?
Magnetic susceptibility  ?
Surface tension 26.6 dyn/cm at 30°C
Viscosity[1]
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
Critical point 593 K (320 °C), 57.8 bar
Eutectic point with water –26.7 °C
Std enthalpy change
of fusionΔfusHo		 +11.7 kJ/mol
Std entropy change
of fusionΔfusSo		 40.5 J/(mol·K)
Std enthalpy change
of vaporizationΔvapHo		 +23.7 kJ/mol
Std entropy change
of vaporizationΔvapSo		  ? J/(mol·K)
Solid properties
Std enthalpy change
of formation ΔfHosolid		  ? kJ/mol
Standard molar entropy
Sosolid		  ? J/(mol K)
Heat capacity cp  ? J/(mol K)
Liquid properties
Std enthalpy change
of formation ΔfHoliquid		 −483.5 kJ/mol
Standard molar entropy
Soliquid		 158.0 J/(mol K)
Enthalpy of combustion, ΔcHo –876.1 kJ/mol
Heat capacity cp 123.1 J/(mol K)
Gas properties
Std enthalpy change
of formation ΔfHogas		 –438.1 kJ/mol
Standard molar entropy
Sogas		 195 J/(mol K)
Heat capacity cp 63.4 J/(mol K)
van der Waals' constants[2] 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/Water[3]
P = 760 mm Hg
BP
Temp.
°C		  % by 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)
Extinction coefficient, ε  ?
IR
Major absorption bands[4]
(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
Other NMR data  
MS
Masses of
main fragments		   60 (75%), 45 (90%),
43 (100%), 42 (13%), 15 (17%)

References

  1. ^ Lange's Handbook of Chemistry, 10th ed. pp 1669-1674
  2. ^ Lange's Handbook of Chemistry 10th ed, pp 1522-1524
  3. ^ "Binary Vapor-Liquid Equilibrium Data" (Queriable database). Chemical Engineering Research Information Center. http://www.cheric.org/research/kdb/hcvle/hcvle.php. Retrieved 5 May 2007. 
  4. ^ "Spectral Database for Organic Compounds" (Queriable database). Advanced Industrial Science and Technology. http://riodb01.ibase.aist.go.jp/sdbs/cgi-bin/cre_index.cgi?lang=eng. Retrieved 9 June 2007. 

Except where noted otherwise, data relate to standard ambient temperature and pressure.

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