Potassium Hydroxide
HKO, 56.105 g/mol. Its structure, the values that were measured, the values that were calculated, and where each one came from.
Identifiers
- Molecular formula
- HKO
- Molecular weight
- 56.105 g/mol
- Exact mass
- 55.966446 g/mol
- IUPAC name
- potassium hydroxide
- [K+].[OH-]
- InChI=1S/K.H2O/h;1H2/q+1;/p-1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M
Measured properties
Values somebody obtained from a sample and published. Where two sources report the same property they are both shown, in the units each used — a disagreement between them is information, and averaging it away would be inventing a number neither one gave.
- Boiling Point
- greater than 266 °F at 760 mmHg (USCG, 1999)
- 2408 °F at 760 mmHg (NTP, 1992)
- Melting Point
- 680 °F approximately (NTP, 1992)
- 405
- Density
- 1.45 to 1.50 at 68 °F (USCG, 1999)
- 2.04 at 59 °F (USCG, 1999) - Denser than water; will sink
- Solubility
- 107 g/100 cc at 59 °F (NTP, 1992)
- Soluble
- Vapor Pressure
- 1 mmHg at 1326 °F ; 5 mmHg at 1497 °F (NTP, 1992)
- 1 MM HG @ 714 °C
Calculated properties
Derived from the structure rather than from a sample. These are reproducible and they are not measurements: a calculated partition coefficient and a measured one can differ by a long way, and where both exist they are listed apart on purpose.
- Molecular weight
- 56.106 g/mol
- Exact mass
- 55.96644614 Da
- Polar surface area
- 1 Ų
- Complexity
- 2
- H-bond donors
- 1
- H-bond acceptors
- 1
- logP
- -3.1728
- Topological polar surface area
- 30 Ų
- H-bond donors
- 0
- H-bond acceptors
- 1
- Rotatable bonds
- 0
- Molar refractivity
- 1.9358 cm³/mol
- Fraction sp³ carbons
- 0
- QED drug-likeness
- 0.2692
What it is made of
Elements
Structure
- Heavy atoms, hydrogen excluded
- 2
- Total atoms, hydrogen included
- 3
- Rings
- 0
- Aromatic rings
- 0
- Stereocentres
- 0
- Formal charge
- 0
The molecule in three dimensions
The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.
Reactions it appears in
Other names for it
The systematic name on this record is potassium hydroxide.
The sources also call it Caustic potash, Potash lye, Potassium hydrate, Hydroxyde de potassium, Potassa, Potasse caustique, Caustic-potash, Kali causticum, Caswell No. 693, Cyantek CC 723, Potassium hydroxide (K(OH)).
Structurally related
Seen alongside it in reaction records
Molecules that appear in the same recorded reactions as Potassium Hydroxide. This says nothing about structure: most of them are the bases, solvents, ligands and catalysts the chemistry needed, and they are here because somebody put them in the same flask.
1,3-Diethylbenzene
C₁₀H₁₄, 134.222 g/mol.
1,3,5-Triethylbenzene
C₁₂H₁₈, 162.276 g/mol.
1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)
C₃₉H₃₂OP₂, 578.632 g/mol.
1,2-Dichloroethane
C₂H₄Cl₂, 98.96 g/mol.
(4-Methoxyphenyl)boronic acid
used as a reactant
C₇H₉BO₃, 151.958 g/mol.
(5-Methyl-1,2-oxazol-3-yl)methanesulfonamide
used as a reactant
C₅H₈N₂O₃S, 176.197 g/mol.
Where these values came from
chemistry engine
What this page does not claim
The identifiers are what the source record holds, copied rather than recomputed. Measured values are reported as their source gave them, units and all; calculated values are marked as calculated and are not measurements. Where a field is absent the page says so, because a blank cell reads as a zero and a guessed value reads as a fact.
Nothing here is a hazard assessment, a purity statement or advice about handling a sample. A flash point quoted from a safety database is a number somebody published, not a judgement by us about whether this molecule is safe for what you intend.