Tert-Butyl alcohol

C₄H₁₀OMolar mass74.123 g·mol Appearance Colorless solid OdorCamphorous Density0.775 g/mL Melting point25 to 26 °C; 77 to 79 °F; 298 to 299 K Boiling point82 to 83 °C; 179 to 181 °F; 355 to 356 K

Solubility in water

miscible SolubilityMiscible with ethanol and diethyl ether log P0.584 Vapor pressure4.1 kPa (at 20 °C) Acidity (pK_a) 16.54

Magnetic susceptibility (χ)

5.742×10 cm/mol

Refractive index (n_D)

1.387

Dipole moment

1.31 D Thermochemistry

Heat capacity(C)

215.37 J/(K·mol)

Std molar
entropy(S₂₉₈)

189.5 J/(K·mol)

Std enthalpy of
formation(Δ_fH₂₉₈)

−360.04 to −358.36 kJ/mol

Std enthalpy of
combustion(Δ_cH₂₉₈)

−2.64479 to −2.64321 MJ/mol Hazards GHS labelling:

Pictograms

Signal word

Danger

Hazard statements

H225, H319, H332, H335

Precautionary statements

P210, P261, P305+P351+P338NFPA 704 (fire diamond)

2

3

0

Flash point11 °C (52 °F; 284 K)

Autoignition
temperature

480 °C (896 °F; 753 K) Explosive limits2.4–8.0% Lethal dose or concentration (LD, LC):

LD₅₀ (median dose)

3559 mg/kg (rabbit, oral)
3500 mg/kg (rat, oral) NIOSH (US health exposure limits):

PEL (Permissible)

TWA 100 ppm (300 mg/m)

REL (Recommended)

TWA 100 ppm (300 mg/m) ST 150 ppm (450 mg/m)

IDLH (Immediate danger)

1600 ppm Safety data sheet (SDS) inchem.orgRelated compounds

Related butanols

Related compounds

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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tert-Butyl alcohol is the simplest tertiary alcohol, with a formula of (CH₃)₃COH (sometimes represented as t-BuOH). Its isomers are 1-butanol, isobutanol, and 2-butanol. tert-Butyl alcohol is a colorless solid, which melts near room temperature and has a camphor-like odor. It is miscible with water, ethanol and diethyl ether.