Acetaldehyde (data page)

This page provides supplementary chemical data on acetaldehyde.

## Material Safety Data Sheet[edit]

The handling of this chemical may require safety precautions. The directions on the Material Safety Datasheet (MSDS) should be followed.

* SDSdata.org index

## Structure and properties[edit]

Structure and properties

Index of refraction, nD | 1.3392 at 18 °C
Abbe number | ?
Dielectric constant, εr | 21.1 ε0 at 21 °C
Bond strength | ?
Bond length | ?
Bond angle | ?
Magnetic susceptibility | ?
Surface tension[1] | 22.3 dyn/cm at 10 °C
21.2 dyn/cm at 20 °C
17.0 dyn/cm at 50 °C
Viscosity[2] | 0.2751 mPa·s at 0 °C
0.2521 mPa·s at 10 °C
0.2307 mPa·s at 20 °C

## Thermodynamic properties[edit]

Phase behavior

Triple point | ? K (? °C), ? Pa
Critical point[3] | 466 K (183 °C), 5570 kPa
Std enthalpy change
of fusion, ΔfusH ~~o~~ | 2.310 kJ/mol
Std entropy change
of fusion, ΔfusS ~~o~~ | 15.43 J/(mol·K)
Std enthalpy change
of vaporization, ΔvapH ~~o~~ | 26.12 kJ/mol
Std entropy change
of vaporization, ΔvapS ~~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 | –196.4 kJ/mol
Standard molar entropy,
S ~~o~~ liquid | 117.3 J/(mol K)
Enthalpy of combustion, ΔcH ~~o~~ | –1167 kJ/mol
Heat capacity, cp | 96.21 J/(mol K) at 0 °C
89.05 J/(mol K) at 25 °C
Gas properties
Std enthalpy change
of formation, ΔfH ~~o~~ gas | –170.7 kJ/mol
Standard molar entropy,
S ~~o~~ gas | 250.3 J/(mol K)
Heat capacity, cp | 55.32 J/(mol K) at 25 °C

## Vapor pressure of liquid[edit]

P in mm Hg | 1 | 10 | 40 | 100 | 400 | 760

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T in °C | –81.5 | –56.8 | –37.8 | –22.6 | 4.9 | 20.2

Table data obtained from CRC Handbook of Chemistry and Physics 44th ed.

log10 of Acetaldehyde vapor pressure. Uses formula:  log e ⁡ P m m H g = {\displaystyle \scriptstyle \log _{e}P_{mmHg}=} log e ⁡ ( 760 101.325 ) − 18.27131 log e ⁡ ( T + 273.15 ) − 7241.251 T + 273.15 + 130.8048 + 2.633634 × 10 − 5 ( T + 273.15 ) 2 {\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-18.27131\log _{e}(T+273.15)-{\frac {7241.251}{T+273.15}}+130.8048+2.633634\times 10^{-5}(T+273.15)^{2}} obtained from CHERIC[3]

## Spectral data[edit]

UV-Vis

λmax | ? nm
Extinction coefficient, ε  | ?

Major absorption bands[4] |  | (liquid film)

Wave number | transmittance
3432 cm−1 | 72%
3001 cm−1 | 66%
2846 cm−1 | 42%
2733 cm−1 | 44%
1727 cm−1 | 4%
1629 cm−1 | 79%
1429 cm−1 | 36%
1401 cm−1 | 41%
1350 cm−1 | 25%
1179 cm−1 | 70%
1114 cm−1 | 29%
945 cm−1 | 77%
767 cm−1 | 61%
514 cm−1 | 35%
NMR
Proton NMR |
Carbon-13 NMR |
Other NMR data  |

Masses of
main fragments  |

## References[edit]

1. ^ Lange's Handbook of Chemistry, 10th ed. pp. 1661–1663
2. ^ Lange's Handbook of Chemistry, 10th ed. pp. 1669–1674
3. ^ a b "Pure Component Properties". Chemical Engineering Research Information Center. Archived from the original on 3 June 2007. Retrieved 27 May 2007.
4. ^ "Spectral Database for Organic Compounds". Advanced Industrial Science and Technology. Archived from the original (Queriable database) on 5 May 2006. Retrieved 9 June 2007.

Linstrom, Peter (1997). "NIST Standard Reference Database". National Institute of Standards and Technology. doi:10.18434/T4D303. `{{cite journal}}`: Cite journal requires `|journal=` (help)

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