Acetic acid (data page)

Chemical data page

This page provides supplementary chemical data on acetic acid.

## Material Safety Data Sheet

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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

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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

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1.0396 mPa·s | at 30 °C
0.7956 mPa·s | at 50 °C
0.4244 mPa·s | at 110 °C

## Thermodynamic properties

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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 fusionΔfusH ~~o~~ | +11.7 kJ/mol
Std entropy change
of fusionΔfusS ~~o~~ | 40.5 J/(mol·K)
Std enthalpy change
of vaporizationΔvapH ~~o~~ | +23.7 kJ/mol
Std entropy change
of vaporizationΔvapS ~~o~~ | ? J/(mol·K)
Solid properties
Std enthalpy change
of formation ΔfH ~~o~~ solid | ? kJ/mol
Standard molar entropy
S ~~o~~ solid | ? J/(mol K)
Heat capacity cp | ? J/(mol K)
Liquid properties
Std enthalpy change
of formation ΔfH ~~o~~ liquid | −483.5 kJ/mol
Standard molar entropy
S ~~o~~ liquid | 158.0 J/(mol K)
Enthalpy of combustion, ΔcH ~~o~~ | –876.1 kJ/mol
Heat capacity cp | 123.1 J/(mol K)
Gas properties
Std enthalpy change
of formation ΔfH ~~o~~ gas | –438.1 kJ/mol
Standard molar entropy
S ~~o~~ gas | 282.84 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

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P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760 | 1520 | 3800 | 7600 | 15200 | 30400 | 45600

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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.

Acetic acid vapor pressure vs. temperature. Uses formula:  P m m H g = 10 7.80307 − 1651.2 225 + T {\displaystyle \scriptstyle P_{mmHg}=10^{7.80307-{\frac {1651.2}{225+T}}}} for T = 0 to 36 °C  P m m H g = 10 7.18807 − 1416.7 211 + T {\displaystyle \scriptstyle P_{mmHg}=10^{7.18807-{\frac {1416.7}{211+T}}}} for T = 36 to 170 °C
Formula from Lange's Handbook of Chemistry, 10th ed. |  log10 of acetic acid vapor pressure vs. temperature. Uses formula:  log 10 ⁡ P m m H g = 7.80307 − 1651.2 225 + T {\displaystyle \scriptstyle \log _{10}P_{mmHg}=7.80307-{\frac {1651.2}{225+T}}} for T = 0 to 36 °C  log 10 ⁡ P m m H g = 7.18807 − 1416.7 211 + T {\displaystyle \scriptstyle \log _{10}P_{mmHg}=7.18807-{\frac {1416.7}{211+T}}} for T = 36 to 170 °C
Formula from Lange's Handbook of Chemistry, 10th ed.

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## Distillation data

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Vapor-liquid Equilibrium for Acetic acid/Water[3]
P = 760 mm Hg

Temp.
°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

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UV-Vis

λmax | 207 nm (gas phase)
Extinction coefficient, ε  | ?

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  |

Masses of
main fragments  |  60 (75%), 45 (90%),
43 (100%), 42 (13%), 15 (17%)

## References

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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. Retrieved 5 May 2007.
4. ^ "Spectral Database for Organic Compounds". Advanced Industrial Science and Technology. Archived from the original (Queriable database) on 14 January 2013. Retrieved 9 June 2007.

* Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD)
* Orlando, John J.; Tyndall, Geoffrey S. (2003). "Gas phase UV absorption spectra for peracetic acid, and for acetic acid monomers and dimers". J. Photochem. Photobiol. A. 157 (2–3): 161–66. Bibcode:2003JPPA..157..161O. doi:10.1016/S1010-6030(03)00067-4.[dead link‍]

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* Except where noted otherwise, data relate to Standard temperature and pressure.
* Reliability of data general note.