Potassium Hydroxide

An inorganic compound, HKO, 56.105 g/mol. Boiling point greater than 266 °F at 760 mmHg, melting point 680 °F approximately, as published.

verified recordInorganic compound5 measured properties

Identifiers

Molecular formula: HKO
Molecular weight: 56.105 g/mol
Exact mass: 55.966446 g/mol
IUPAC name: potassium hydroxide
SMILES: [K+].[OH-]
InChI: InChI=1S/K.H2O/h;1H2/q+1;/p-1
InChIKey: KWYUFKZDYYNOTN-UHFFFAOYSA-M

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: greater than 266 °F at 760 mmHg (USCG, 1999)measured · CAMEO Chemicals; 2408 °F at 760 mmHg (NTP, 1992)measured · CAMEO Chemicals
Melting Point: 680 °F approximately (NTP, 1992)measured · CAMEO Chemicals; 405measured · DrugBank
Density: 1.45 to 1.50 at 68 °F (USCG, 1999)measured · CAMEO Chemicals; 2.04 at 59 °F (USCG, 1999) - Denser than water; will sinkmeasured · CAMEO Chemicals
Solubility: 107 g/100 cc at 59 °F (NTP, 1992)measured · CAMEO Chemicals; Solublemeasured · DrugBank
Vapor Pressure: 1 mmHg at 1326 °F ; 5 mmHg at 1497 °F (NTP, 1992)measured · CAMEO Chemicals; 1 MM HG @ 714 °Cmeasured · Hazardous Substances Data Bank (HSDB)

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 56.106 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 55.96644614 Dacalculated · reference compound database; Mass of the most common isotopic form.
Polar surface area: 1 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 2calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 1calculated · reference compound database
logP: -3.1728calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 30 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 0calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 0calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 1.9358 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.2692calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

K Potassium1 atom · 69.7% by mass
O Oxygen1 atom · 28.5% by mass
H Hydrogen1 atom · 1.8% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

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

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

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

No documented reaction with a written procedure and a source involves Potassium Hydroxide yet.

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

Nothing structurally close to Potassium Hydroxide has a page here yet.

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.

1,3,5-Triethylbenzene

C₁₂H₁₈, 162.276 g/mol.

1,3-Diethylbenzene

C₁₀H₁₄, 134.222 g/mol.

1,2-Dichloroethane

C₂H₄Cl₂, 98.96 g/mol.

1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)

C₃₉H₃₂OP₂, 578.632 g/mol.

(4-Methoxyphenyl)boronic acid

used as a reactant

C₇H₉BO₃, 151.958 g/mol.

Where these values came from

reference compound database14797
compound record
chemistry engine
structure perception

compound record.

What this page does not claim

Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.