Acetaldehyde (data page)

This page provides supplementary chemical data on acetaldehyde.

Material Safety Data Sheet

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

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

Phase behavior
Triple point	? K (? °C), ? Pa
Critical point[3]	466 K (183 °C), 5570 kPa
Std enthalpy change of fusion, ΔfusHo	2.310 kJ/mol
Std entropy change of fusion, ΔfusSo	15.43 J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo	26.12 kJ/mol
Std entropy change of vaporization, ΔvapSo	? 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	–196.4 kJ/mol
Standard molar entropy, Soliquid	117.3 J/(mol K)
Enthalpy of combustion, ΔcHo	–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, ΔfHogas	–170.7 kJ/mol
Standard molar entropy, Sogas	250.3 J/(mol K)
Heat capacity, cp	55.32 J/(mol K) at 25 °C

Vapor pressure of liquid

P in mm Hg		1	10	40	100	400	760
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: ${\displaystyle \scriptstyle \log _{e}P_{mmHg}=}$${\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

UV-Vis
λmax	? nm
Extinction coefficient, ε	?
IR
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
MS
Masses of main fragments