Chemical Properties of Hydroquinone (CAS 123-31-9)

InChI

InChI=1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H

InChI Key

QIGBRXMKCJKVMJ-UHFFFAOYSA-N

Formula

C6H6O2

SMILES

Oc1ccc(O)cc1

Molecular Weight¹

110.11

CAS

123-31-9

Other Names

• 1,4-Benzenediol (hydroquinone)
• 1,4-Dihydroxy-benzeen
• 1,4-Dihydroxy-benzol
• 1,4-Dihydroxybenzen
• 1,4-Diidrobenzene
• 1,4-benzenediol
• 1,4-dihydroxybenzene
• 4-Hydroxyphenol
• Aida
• Arctuvin
• Benzene, p-dihydroxy-
• Black & White Bleaching Cream
• Black and White Bleaching Cream
• Derma-Blanch
• Diak 5
• Dihydroquinone
• Eldopacque
• Eldopaque
• Eldopaque forte
• Eldoquin
• Eldoquin forte
• HE 5
• Hidroquinone
• Hydrochinon
• Hydrochinone
• Hydroquinol
• Hydroquinole
• Idrochinone
• NCI-C55834
• Phiaquin
• Quinol
• Solaquin forte
• Tecquinol
• Tenox HQ
• Tequinol
• UN 2662
• USAF EK-356
• benzohydroquinone
• benzoquinol
• p-Dihydroquinone
• p-Dioxobenzene
• p-Hydroquinone
• p-benzenediol
• p-dihydroxybenzene
• p-dioxybenzene
• p-hydroxyphenol
• p-quinol

• ω : Acentric Factor.
• Δ_cH°_solid : Standard solid enthalpy of combustion (kJ/mol).
• C_p,gas : Ideal gas heat capacity (J/mol×K).
• C_p,solid : Solid phase heat capacity (J/mol×K).
• η : Dynamic viscosity (Pa×s).
• Δ_fG° : Standard Gibbs free energy of formation (kJ/mol).
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fH°_solid : Solid phase enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH° : Enthalpy of fusion at standard conditions (kJ/mol).
• Δ_fusH : Enthalpy of fusion at a given temperature (kJ/mol).
• Δ_subH° : Enthalpy of sublimation at standard conditions (kJ/mol).
• Δ_subH : Enthalpy of sublimation at a given temperature (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• Δ_vapH : Enthalpy of vaporization at a given temperature (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• McVol : McGowan's characteristic volume (ml/mol).
• P_c : Critical Pressure (kPa).
• P_sub : Sublimation pressure (kPa).
• ρ_l : Liquid Density (kg/m³).
• ρ_s : Solid Density (kg/m³).
• I_np : Non-polar retention indices.
• I : Polar retention indices.
• Δ_fusS : Entropy of fusion at a given temperature (J/mol×K).
• S°_gas : Molar entropy at standard conditions (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_boilr : Boiling point at reduced pressure (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• T_triple : Triple Point Temperature (K).
• V_c : Critical Volume (m³/kmol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ω	0.5944		Relay (1.0) Calculated Property
ΔcH°solid	[-2865.00; -2824.68]	kJ/mol
ΔcH°solid	-2847.50 ± 1.20	kJ/mol	NIST
ΔcH°solid	Outlier -2824.68	kJ/mol	NIST
ΔcH°solid	-2852.40 ± 0.88	kJ/mol	NIST
ΔcH°solid	-2855.60	kJ/mol	NIST
ΔcH°solid	-2858.00	kJ/mol	NIST
ΔcH°solid	-2865.00	kJ/mol	NIST
ΔcH°solid	-2856.00	kJ/mol	NIST
ΔcH°solid	-2861.00	kJ/mol	NIST
ΔfG°	-187.56	kJ/mol	Joback Calculated Property
ΔfH°gas	[-277.00; -266.90]	kJ/mol
ΔfH°gas	-277.00 ± 1.40	kJ/mol	NIST
ΔfH°gas	-272.00	kJ/mol	NIST
ΔfH°gas	-268.90	kJ/mol	NIST
ΔfH°gas	-266.90	kJ/mol	NIST
ΔfH°gas	-268.40	kJ/mol	NIST
ΔfH°solid	[-371.10; -361.00]	kJ/mol
ΔfH°solid	-371.10 ± 1.30	kJ/mol	NIST
ΔfH°solid	-366.10 ± 1.20	kJ/mol	NIST
ΔfH°solid	-363.00 ± 1.00	kJ/mol	NIST
ΔfH°solid	-361.00	kJ/mol	NIST
ΔfH°solid	-362.50	kJ/mol	NIST
ΔfusH°	[23.78; 27.23]	kJ/mol
ΔfusH°	27.23	kJ/mol	Di-Hydroxybenzenes: Catechol, Resorcinol, and Hydroquinone. Enthalpies of Phase Transitions Revisited
ΔfusH°	23.78	kJ/mol	Measurement of enthalpy curves of phase change materials via DSC and T-History: When are both methods needed to estimate the behaviour of the bulk material in applications?
ΔsubH°	[94.10; 103.76]	kJ/mol
ΔsubH°	94.13 ± 0.53	kJ/mol	NIST
ΔsubH°	94.10	kJ/mol	NIST
ΔsubH°	94.10 ± 0.50	kJ/mol	NIST
ΔsubH°	99.20 ± 1.70	kJ/mol	NIST
ΔsubH°	Outlier 103.76	kJ/mol	NIST
ΔsubH°	94.13 ± 0.53	kJ/mol	NIST
ΔsubH°	94.10	kJ/mol	NIST
ΔsubH°	94.10 ± 0.50	kJ/mol	NIST
ΔvapH°	84.40 ± 0.70	kJ/mol	NIST
IE	[7.93; 8.44]	eV
IE	7.94 ± 0.01	eV	NIST
IE	7.93 ± 0.01	eV	NIST
IE	7.95 ± 0.05	eV	NIST
IE	7.95 ± 0.03	eV	NIST
IE	8.44	eV	NIST
log10WS	[-0.17; -0.17]
log10WS	-0.17		Aq. Solubility Prediction
log10WS	-0.17		Estimated Solubility
logPoct/wat	1.098		Crippen Calculated Property
McVol	83.380	ml/mol	McGowan Calculated Property
Pc	7561.44	kPa	Joback Calculated Property
Inp	[207.49; 1334.00]
Inp	1327.00		NIST
Inp	1334.00		NIST
Inp	1241.00		NIST
Inp	1334.00		NIST
Inp	220.60		NIST
Inp	207.49		NIST
Inp	1327.00		NIST
Inp	1334.00		NIST
Inp	1241.00		NIST
Inp	220.60		NIST
I	[2693.00; 2693.00]
I	2693.00		NIST
I	2693.00		NIST
I	2693.00		NIST
S°gas	343.10 ± 5.00	J/mol×K	NIST
Tboil	[558.20; 558.20]	K
Tboil	558.20	K	NIST
Tboil	558.20 ± 1.00	K	NIST
Tc	751.62	K	Relay (1.0) Calculated Property
Tfus	[443.50; 445.35]	K
Tfus	445.15	K	Liquid pharmaceuticals formulation by eutectic formation
Tfus	445.00	K	Enthalpies of formation of dihydroxybenzenes revisited: Combining experimental and high-level ab initio data
Tfus	445.35	K	Aq. Solubility Prediction
Tfus	445.00 ± 0.60	K	NIST
Tfus	445.00	K	NIST
Tfus	Outlier 443.50 ± 0.30	K	NIST
Tfus	445.00 ± 0.60	K	NIST
Ttriple	[445.50; 445.98]	K
Ttriple	445.98 ± 0.03	K	NIST
Ttriple	445.50 ± 0.30	K	NIST
Ttriple	445.98 ± 0.03	K	NIST
Ttriple	445.50 ± 0.30	K	NIST
Vc	0.252	m3/kmol	Relay (1.0) Calculated Property

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	[186.38; 226.37]	J/mol×K	[519.82; 767.15]
Cp,gas	186.38	J/mol×K	519.82	Joback Calculated Property
Cp,gas	194.89	J/mol×K	561.04	Joback Calculated Property
Cp,gas	202.45	J/mol×K	602.26	Joback Calculated Property
Cp,gas	209.22	J/mol×K	643.48	Joback Calculated Property
Cp,gas	215.36	J/mol×K	684.70	Joback Calculated Property
Cp,gas	221.02	J/mol×K	725.92	Joback Calculated Property
Cp,gas	226.37	J/mol×K	767.15	Joback Calculated Property
Cp,solid	[130.50; 150.20]	J/mol×K	[274.30; 323.00]
Cp,solid	130.50	J/mol×K	274.30	NIST
Cp,solid	133.50	J/mol×K	297.90	NIST
Cp,solid	139.70	J/mol×K	298.00	NIST
Cp,solid	131.90	J/mol×K	298.15	NIST
Cp,solid	136.40	J/mol×K	298.15	NIST
Cp,solid	150.20	J/mol×K	323.00	NIST
η	[0.0000250; 0.0009603]	Pa×s	[394.72; 519.82]
η	0.0009603	Pa×s	394.72	Joback Calculated Property
η	0.0004487	Pa×s	415.57	Joback Calculated Property
η	0.0002255	Pa×s	436.42	Joback Calculated Property
η	0.0001207	Pa×s	457.27	Joback Calculated Property
η	0.0000682	Pa×s	478.12	Joback Calculated Property
η	0.0000404	Pa×s	498.97	Joback Calculated Property
η	0.0000250	Pa×s	519.82	Joback Calculated Property
ΔfusH	[26.48; 27.23]	kJ/mol	[444.95; 453.00]
ΔfusH	26.50	kJ/mol	444.95	NIST
ΔfusH	26.50	kJ/mol	444.95	NIST
ΔfusH	27.23	kJ/mol	445.10	NIST
ΔfusH	27.11	kJ/mol	445.10	NIST
ΔfusH	27.11	kJ/mol	445.10	NIST
ΔfusH	27.11	kJ/mol	445.50	NIST
ΔfusH	27.11	kJ/mol	445.50	NIST
ΔfusH	26.48	kJ/mol	453.00	NIST
ΔfusH	26.48	kJ/mol	453.00	NIST
ΔsubH	[93.70; 104.00]	kJ/mol	[322.00; 370.50]
ΔsubH	103.80	kJ/mol	322.00	NIST
ΔsubH	100.60 ± 1.30	kJ/mol	332.00	NIST
ΔsubH	93.70 ± 0.50	kJ/mol	334.00	NIST
ΔsubH	93.70 ± 0.50	kJ/mol	334.00	NIST
ΔsubH	103.80	kJ/mol	335.50	NIST
ΔsubH	104.00 ± 1.00	kJ/mol	342.00	NIST
ΔsubH	99.00 ± 2.00	kJ/mol	351.00	NIST
ΔsubH	101.30	kJ/mol	370.50	NIST
ΔvapH	70.50	kJ/mol	503.50	NIST
Psub	[5.13e-05; 3.53e-04]	kPa	[322.80; 339.40]
Psub	5.56e-05	kPa	322.80	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	5.45e-05	kPa	322.80	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	5.13e-05	kPa	322.80	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	6.59e-05	kPa	324.80	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	7.43e-05	kPa	324.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	6.93e-05	kPa	324.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	9.44e-05	kPa	326.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	8.72e-05	kPa	326.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	8.46e-05	kPa	326.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.13e-04	kPa	328.90	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.09e-04	kPa	329.00	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.05e-04	kPa	329.00	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.38e-04	kPa	331.00	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.38e-04	kPa	331.00	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.42e-04	kPa	331.10	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.77e-04	kPa	333.10	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.72e-04	kPa	333.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	1.69e-04	kPa	333.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.32e-04	kPa	335.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.17e-04	kPa	335.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.12e-04	kPa	335.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.62e-04	kPa	337.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.75e-04	kPa	337.30	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	2.64e-04	kPa	337.30	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	3.53e-04	kPa	339.20	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	3.40e-04	kPa	339.40	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
Psub	3.33e-04	kPa	339.40	Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
ρl	1328.00	kg/m3	293.15	Measurements of Liquid Liquid Equilibria for the Quaternary System 2-Methoxy-2-methylpropane + Phenol + Hydroquinone + Water at 313.15 K
ρs	[1332.00; 1338.00]	kg/m3	[293.20; 298.15]
ρs	1332.00	kg/m3	293.20	Ternary and Quaternary Liquid-Liquid Equilibria for Systems of Methyl Butyl Ketone + Water + Hydroquinone + Phenol at 313.2 K and Atmospheric Pressure
ρs	1338.00	kg/m3	298.15	Liquid liquid equilibria for the quaternary system methyl isobutyl ketone water phenol hydroquinone
ΔfusS	[59.00; 60.90]	J/mol×K	[444.95; 445.50]
ΔfusS	59.00	J/mol×K	444.95	NIST
ΔfusS	59.00	J/mol×K	444.95	NIST
ΔfusS	60.90	J/mol×K	445.50	NIST
ΔfusS	60.90	J/mol×K	445.50	NIST

Pressure Dependent Properties

Property	Value	Unit	Pressure (kPa)	Source
Tboilr	[558.00; 558.20]	K	[97.30; 97.30]
Tboilr	558.20	K	97.30	NIST
Tboilr	558.00	K	97.30	NIST

Similar Compounds

Find more compounds similar to Hydroquinone.

Mixtures

• Choline chloride + Hydroquinone
• 2-Butanone, 3-methyl- + Hydroquinone + Water
• Hydroquinone + Water
• Methyl Isobutyl Ketone + Hydroquinone + Water
• 2-Hexanone + Hydroquinone + Water
• 2-Octanone + Hydroquinone + Water
• Hydroquinone + Propane, 2-methoxy-2-methyl- + Water
• Hydroquinone + Ethyl Acetate
• Hydroquinone + Acetic acid, butyl ester
• Hydroquinone + Acetic acid
• Hydroquinone + Methyl Alcohol
• Ethanol + Hydroquinone
• 2-Propanol + Hydroquinone
• 2-Pentanone + Hydroquinone + Water
• Hydroquinone + Water + 1,4,7,10,13,16-Hexaoxacyclooctadecane

Sources

• Cheméo Relay (1.0)
• Crippen Method
• Liquid liquid equilibria for the quaternary system methyl isobutyl ketone water phenol hydroquinone
• Ternary liquid-liquid equilibria for methyl isopropyl ketone + (resorcinol or hydroquinone) + water systems at different temperatures
• Liquid-liquid equilibrium for ternary systems, methyl isobutyl ketone +(catechol, resorcinol and hydroquinone) + water at 333.15 K, 343.15 K and 353.15 K
• Liquid pharmaceuticals formulation by eutectic formation
• Heat capacities of aqueous polar aromatic compounds over a wide range of conditions. Part II: dihydroxybenzenes, aminophenols, diaminobenzenes
• Effects of structural isomerism on solution behaviour of solutes: Apparent molar volumes and isentropic compression of catechol, resorcinal, and hydroquinone in aqueous solution at T = (283.15, 293.15, 298.15, 303.15, and 313.15) K
• Enthalpies of formation of dihydroxybenzenes revisited: Combining experimental and high-level ab initio data
• Experimental result and data correlation of liquid-liquid equilibrium for methyl isopropyl ketone + o, m, p-dihydroxybenzene + water at 333.15 K, 343.15 K and 353.15 K
• Di-Hydroxybenzenes: Catechol, Resorcinol, and Hydroquinone. Enthalpies of Phase Transitions Revisited
• Measurement of enthalpy curves of phase change materials via DSC and T-History: When are both methods needed to estimate the behaviour of the bulk material in applications?
• Analysis of solute-pyridine intermolecular interactions based on experimental enthalpies of solution and enthalpies of solvation of solutes dissolved in pyridine
• Ternary and Quaternary Liquid-Liquid Equilibria for Systems of Methyl Butyl Ketone + Water + Hydroquinone + Phenol at 313.2 K and Atmospheric Pressure
• Solubility of 3,7,9,11-Tetraoxo-2,4,6,8,10-pentaaza[3.3.3] Propellane (TOPAP) in Different Pure Solvents at Temperatures between 273.15 and 318.15 K
• Liquid-Liquid Equilibria for Ternary (Methyl Propyl Ketone + Hydroquinone or Resorcinol + Water) Systems at 298.15, 318.15, and 333.15 K
• Liquid Liquid Equilibria for Octan-2-one + Dihydroxybenzene + Water at Different Temperatures: Experimental Data and Thermodynamic Modeling
• Measurements and Thermodynamic Modeling of Liquid-Liquid Equilibria Data for the Ternary (Methyl Propyl Ketone + Catechol/Resorcinol/Hydroquinone + Water) Systems
• Solubility of Hydroquinone in Different Solvents from 276.65 K to 345.10 K
• Vapor Pressure Characterization of Several Phenolics and Polyhydric Compounds by Knudsen Effusion Method
• Liquid-Liquid Equilibria for the Ternary System Methyl Isobutyl Ketone + Water + Hydroquinone
• Measurements of Liquid Liquid Equilibria for the Quaternary System 2-Methoxy-2-methylpropane + Phenol + Hydroquinone + Water at 313.15 K
• Liquid Liquid Equilibria for Ternary Systems: Methyl Butyl Ketone + Phenol + Water and Methyl Butyl Ketone + Hydroquinone + Water at 298.15 K and 323.15 K
• Activity Coefficient Studies in Ternary Aqueous Solutions at 298.15 K: H2O + r-Cyclodextrin + Potassium Acetate and H2O + 18-Crown-6 + Hydroquinone Systems
• Joback Method
• KDB
• Aqueous Solubility Prediction Method
• Estimated Solubility Method
• McGowan Method
• NIST Webbook

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