A summary of the most common chemical descriptors (InChI Key and SMILES codes) for KHSO4 are summarized together with 3D and 2D structures and relevant physico-chemical properties.

What is the KHSO4?

The molecule KHSO4 presents a molecular formula of HKO4S and its IUPAC name is potassium; hydrogen sulfate.

The chemical compound potassium hydrogen sulfate, commonly abbreviated to "KHSO4", is the potassium salt of sulfuric acid. It is a colorless, odorless, and hygroscopic solid that is highly soluble in water. It has a wide range of applications, including in food processing, as a fertilizer, and in the textile industry..

The structure of KHSO4 is similar to that of sodium hydrogen sulfate (NaHSO4), with the potassium cation (K+) replacing the sodium cation (Na+). The compound is formed by the reaction of sulfuric acid (H2SO4) with potassium hydroxide (KOH)..

KHSO4 is used as a food additive, particularly in the production of processed cheese and powdered milk. It is also used as a fertilizer, and in the textile industry as a bleaching agent..

The compound is relatively safe to handle, but contact with skin or eyes should be avoided as it can cause irritation. In case of contact, immediately flush the affected area with water for 15 minutes. If swallowed, drink plenty of water and seek medical attention..

3D structure

Cartesian coordinates

Geometry of KHSO4 in x, y and z coordinates (Å units) to copy/paste elsewhere. Generated with Open Babel software.

2D drawing


KHSO4 CHKVPAROMQMJNQ-UHFFFAOYSA-M chemical compound 2D structure molecule svg


Molecule descriptors

IUPAC namepotassium; hydrogen sulfate
InChI codeInChI=1S/K.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1

Other names (synonyms)

IUPAC nomenclature provides a standardized method for naming chemical compounds. Although this system is widely used in chemistry, many chemical compounds have also other names commonly used in different contexts. These synonyms can come from a variety of sources and are used for a variety of purposes.

One common source of synonyms for chemical compounds is the common or trivial names, assigned on the basis of appearance, properties, or origin of the molecule.

Another source of synonyms are historical or obsolete names employed in the past, however replaced nowadays by more modern or standardized names.

In addition to common and historical names, chemical compounds may also have synonyms that are specific to a particular field or industry.

Reference codes for other databases

There exist several different chemical codes commonly used in orded to identify molecules:

Physico-Chemical properties

IUPAC namepotassium; hydrogen sulfate
Molecular formulaHKO4S
Molecular weight136.17
Melting point (ºC)214
Boiling point (ºC) -
Density (g/cm3)2.320
Molar refractivity
Topological polar surface area85.8

LogP and topological polar surface area (TPSA) values were estimated using Open Babel software.

The n-octanol/water partition coeficient (Kow) data is applied in toxicology and drug research. Kow values are used, to guess the environmental fate of persistent organic pollutants. High partition coefficients values, tend to accumulate in the fatty tissue of organisms. Molecules with a log(Kow) (or LogP) greater than 5 are considered to bioaccumulate.

TPSA values are the sum of the surface area over all polar atoms or molecules, mainly oxygen and nitrogen, also including hydrogen atoms.

In medicinal chemistry, TPSA is used to assess the ability of a drug to permeabilise cells.

For molecules to penetrate the blood-brain barrier (and act on receptors in the central nervous system), TPSA values below 90 Å2 are required. Thus, molecules with a polar surface area greater than 140 Å2 tend to be poorly permeable to cell membranes.