# 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, n$_D$ | 1.3776 at 20°C |
| Abbe number | ? |
| Dielectric constant, ε$_r$ | 18.23 ε$_0$ 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, Δ$_{fus}$H$^o$ | 5.28 kJ/mol |
| Std entropy change of fusion, Δ$_{fus}$S$^o$ | 28.6 J/(mol·K) |
| Std enthalpy change of vaporization, Δ$_{vap}$H$^o$ | 44.0 kJ/mol |
| Std entropy change of vaporization, Δ$_{vap}$S$^o$ | 124 J/(mol·K) |
| Solid properties ||
| Std enthalpy change of formation, Δ$_f$H$^o$$_{solid}$ | ? kJ/mol |
| Standard molar entropy, S$^o$$_{solid}$ | ? J/(mol K) |
| Heat capacity, c$_p$ | 0.212 J/(mol K) at −200°C |
| Liquid properties ||
| Std enthalpy change of formation, Δ$_f$H$^o$$_{liquid}$ | −318.2 kJ/mol |
| Standard molar entropy, S$^o$$_{liquid}$ | 180 J/(mol K) |
| Heat capacity, c$_p$ | 2.68 J/(gK) at 20°C-25°C |
| Gas properties ||
| Std enthalpy change of formation, Δ$_f$H$^o$$_{gas}$ | −261.1 kJ/mol |
| Standard molar entropy, S$^o$$_{gas}$ | 333 J/(mol K) |
| Heat capacity, c$_p$ | 1.54 J/(gK) at 25°C |

## Vapor pressure of Iso-propyl Alcohol

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

## Distillation data

Vapor-liquid equilibrium for isopropanol/water P = 760 mm Hg :
| BP temp. °C | % by mole isopropanol | % by mole isopropanol |
| BP temp. °C | 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 | % by mole methanol |
| BP temp. °C | 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 | % by mole acetone |
| BP temp. °C | 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 :
| λ$_{max}$ | 205 nm |
| Extinction coefficient, ε | 100.2 m$^2$/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) |
* view
* Except where noted otherwise, data relate to Standard temperature and pressure.
* Reliability of data general note.