Chemical Properties of potassium (CAS 7440-09-7)

InChI

InChI=1S/K

InChI Key

ZLMJMSJWJFRBEC-UHFFFAOYSA-N

Formula

K

SMILES

[K]

Molecular Weight¹

39.10

CAS

7440-09-7

• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• IE : Ionization energy (eV).
• NFPA Fire : NFPA Fire Rating.
• NFPA Health : NFPA Health Rating.
• NFPA Safety : NFPA Safety Rating.
• P_vap : Vapor pressure (kPa).
• S°_{gas,1 bar} : Molar entropy at standard conditions (1 bar) (J/mol×K).
• S°_{solid,1 bar} : Solid phase molar entropy at standard conditions (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_triple : Triple Point Temperature (K).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
ΔfH°gas	89.00 ± 0.80	kJ/mol	NIST
IE	[4.10; 4.50]	eV
IE	4.34 ± 0.00	eV	NIST
IE	4.34	eV	NIST
IE	4.34	eV	NIST
IE	4.34 ± 0.00	eV	NIST
IE	4.50 ± 1.00	eV	NIST
IE	4.40	eV	NIST
IE	Outlier 4.10 ± 0.30	eV	NIST
IE	4.34	eV	NIST
IE	4.34	eV	NIST
NFPA Fire	1		KDB
NFPA Health	3		KDB
NFPA Safety	2		KDB
S°gas,1 bar	160.34 ± 0.00	J/mol×K	NIST
S°solid,1 bar	64.68 ± 0.20	J/mol×K	NIST
Tboil	1037.00 ± 1.00	K	NIST
Ttriple	336.35 ± 0.10	K	NIST

Correlations

Property	Value	Unit	Temperature (K)	Source
Pvap	[1.13e-07; 16569.18]	kPa	[336.35; 2223.00]	The Yaw...
Equation			ln(Pvp) = A + B/(T + C)
Coefficient A			1.40440e+01
Coefficient B			-9.54174e+03
Coefficient C			-1.86800e+01
Temperature range, min.			336.35
Temperature range, max.			2223.00
Pvap	1.13e-07	kPa	336.35	Calculated Property
Pvap	0.02	kPa	545.98	Calculated Property
Pvap	2.99	kPa	755.61	Calculated Property
Pvap	52.64	kPa	965.23	Calculated Property
Pvap	327.39	kPa	1174.86	Calculated Property
Pvap	1161.89	kPa	1384.49	Calculated Property
Pvap	2943.59	kPa	1594.12	Calculated Property
Pvap	5994.72	kPa	1803.74	Calculated Property
Pvap	10513.22	kPa	2013.37	Calculated Property
Pvap	16569.18	kPa	2223.00	Calculated Property

Sources

• Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Potassium Benzoate C7H5O2K(s)
• A calorimetric and thermodynamic investigation of potassium uranyl tungstate K2[(UO2)(W2O8)]
• A calorimetric and thermodynamic investigation of A2[(UO2)2(MoO4)O2] compounds with A = K and Rb and calculated phase relations in the system (K2MoO4 + UO3 + H2O)
• Thermochemical properties of microporous materials for two borogermanates, .beta.-K2[B2Ge3O10] and NH4[BGe3O8]
• A calorimetric investigation of A2[(UO2)2(WO5)O] compounds with A = K, Rb and Cs and calculated phase relations in the K2WO4-UO3-H2O and K2MoO4-K2WO4-UO3-H2O systems
• Synthesis and energetics of Na, K, Rb and Cs salts by reaction with 1,2-ethanediol and 1,4-butanediol
• Thermochemistry of Potassium Strontium Tetraborate Decahydrated
• Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Potassium Hydrogen Phthalate C8H5KO4(s)
• KDB
• NIST Webbook
• The Yaws Handbook of Vapor Pressure

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Outlier This icon means that the value is more than 2 standard deviations away from the property mean.