Isopropyl alcohol (data page)

This page provides supplementary chemical data on isopropanol.

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 such as eChemPortal, and follow its directions.

Structure and properties

Structure and properties
Index of refraction, nD	1.3776 at 20°C
Abbe number	?
Dielectric constant, εr	18.23 ε0 at 25 °C
Bond strength	?
Bond length	?
Bond angle	?
Magnetic susceptibility	?
Surface tension	21.7 dyn/cm at 20°C
Viscosity	4.5646 mPa·s at 0°C 2.3703 mPa·s at 20°C 1.3311 mPa·s at 40°C

Thermodynamic properties

Phase behavior
Triple point	184.9 K (−88.2 °C), ? Pa
Critical point	508.7 K (235.6 °C), 5370 kPa
Std enthalpy change of fusion, ΔfusHo	5.28 kJ/mol
Std entropy change of fusion, ΔfusSo	28.6 J/(mol·K)
Std enthalpy change of vaporization, ΔvapHo	44.0 kJ/mol
Std entropy change of vaporization, ΔvapSo	124 J/(mol·K)
Solid properties
Std enthalpy change of formation, ΔfHosolid	? kJ/mol
Standard molar entropy, Sosolid	? J/(mol K)
Heat capacity, cp	0.212 J/(mol K) at −200°C
Liquid properties
Std enthalpy change of formation, ΔfHoliquid	−318.2 kJ/mol
Standard molar entropy, Soliquid	180 J/(mol K)
Heat capacity, cp	2.68 J/(gK) at 20°C-25°C
Gas properties
Std enthalpy change of formation, ΔfHogas	−261.1 kJ/mol
Standard molar entropy, Sogas	333 J/(mol K)
Heat capacity, cp	1.54 J/(gK) at 25°C

Vapor pressure of Iso-propyl Alcohol

P in mm Hg		1	10	40	100	400	760	1520	3800	7600	15200	30400	45600
T in °C		−26.1	2.4	23.8	39.5	67.8	82.5	101.3	130.2	155.7	186.0	220.2	—

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

Isopropanol vapor pressure (logarithmic scale) vs temperature. Drawn using data published in

Distillation data

Vapor-liquid equilibrium for isopropanol/water P = 760 mm Hg BP temp. °C % by mole isopropanol liquid vapor 82.2 100.00 100.00 81.48 95.35 93.25 80.70 87.25 83.40 80.37 80.90 77.45 80.23 76.50 73.70 80.11 69.55 69.15 80.16 66.05 67.15 80.15 64.60 66.45 80.31 55.90 62.55 80.38 51.45 60.75 80.67 44.60 59.20 80.90 38.35 57.00 81.28 29.80 55.10 81.29 29.75 55.40 81.23 28.35 55.30 81.62 24.50 53.90 81.75 19.35 53.20 81.58 18.95 53.75 81.99 16.65 52.15 82.32 12.15 51.20 82.70 10.00 50.15 84.57 5.70 45.65 88.05 3.65 36.55 93.40 1.60 21.15 95.17 1.15 16.30 100.0 0.00 0.00

Vapor-liquid equilibrium for isopropanol/methanol P = 101.325 kPa BP temp. °C % by mole methanol liquid vapor 64.37 100.0 100.0 67.34 81.26 90.32 67.64 79.45 89.10 69.54 68.64 81.73 70.77 61.72 76.52 71.88 55.96 71.76 72.78 51.03 67.78 73.80 46.34 63.08 74.85 39.75 56.21 75.65 35.50 51.62 76.36 31.71 46.91 77.93 23.79 35.98 78.67 19.49 30.22 79.45 15.45 24.40 80.04 12.30 19.56 80.57 9.30 14.66 80.82 8.43 12.43 82.20 0.0 0.0

Vapor-liquid equilibrium for isopropanol/acetone P = 101.325 kPa BP temp. °C % by mole acetone liquid vapor 77.92 6.12 19.90 76.71 8.28 25.52 71.50 19.59 47.03 70.99 20.91 48.90 69.20 26.01 55.29 68.85 27.10 56.50 65.91 37.55 66.12 63.55 48.12 73.37 63.42 48.74 73.75 62.46 53.77 76.63 62.37 54.27 76.91 61.85 57.22 78.49 61.86 57.12 78.43

See also

• Tetrachloroethylene (data page)

Spectral data

UV-Vis
λmax	205 nm
Extinction coefficient, ε	100.2 m2/mol
IR
Major absorption bands	3334, 2970, 1466, 1378, 1160, 1128, 951, 817, 639 cm−1
NMR
Proton NMR
Carbon-13 NMR
Other NMR data
MS
Masses of main fragments	m/z (% of relative intensity): 45 (100), 43 (19.1), 27 (16.8), 29 (12.5), 19 (9.9), 15 (9.5), 41 (8.2), 31 (6.8), 39 (6.6), 42 (4.4)

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