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Potassium Dihydrogen Phosphate

CAS #:

Linear Formula:


MDL Number:


EC No.:



(2N) 99% Potassium Dihydrogen Phosphate
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(3N) 99.9% Potassium Dihydrogen Phosphate
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(4N) 99.99% Potassium Dihydrogen Phosphate
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(5N) 99.999% Potassium Dihydrogen Phosphate
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Potassium Dihydrogen Phosphate Properties (Theoretical)

Compound Formula KH2PO4
Molecular Weight 136.09
Appearance White powder
Melting Point 252.6 °C
Boiling Point 400 °C (dec.)
Density 2.338 g/cm3
Solubility in H2O 22.6 g/100 mL (20 °C)
Refractive Index nD 1.4864
Crystal Phase / Structure Tetragonal
Exact Mass N/A
Monoisotopic Mass 135.93277
Charge N/A

Potassium Dihydrogen Phosphate Health & Safety Information

Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
RTECS Number TC6615500
Transport Information NONH for all modes of transport
WGK Germany 1

About Potassium Dihydrogen Phosphate

High purity Potassium Dihydrogen PhosphatePotassium Dihydrogen Phosphate (KDP) is a crystalline solid used in photo optic applications. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.

Potassium Dihydrogen Phosphate Synonyms

Potassium phosphate monobasic, Monopotassium phosphate, MKP, potassium dihydrogenphosphate, KDP, Potassium dihydrogen(tetraoxidophosphate)(1−), Phosphoric acid, monopotassium salt, potassium biphosphate

Chemical Identifiers

Linear Formula KH2PO4
MDL Number MFCD00011401
EC No. 231-913-4
Beilstein Registry No. N/A
Pubchem CID 516951
IUPAC Name potassium dihydrogen phosphate
SMILES [K+].[O-]P(=O)(O)O
InchI Identifier InChI=1S/K.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements

Phosphorus Bohr ModelSee more Phosphorus products. Phosphorus (atomic symbol: P, atomic number: 15) is a Block P, Group 15, Period 3 element. The number of electrons in each of Phosphorus's shells is 2, 8, 5 and its electronic configuration is [Ne] 3s2 3p3. The phosphorus atom has a radius of 110.5.pm and its Van der Waals radius is 180.pm. Phosphorus is a highly-reactive non-metallic element (sometimes considered a metalloid) with two primary allotropes, white phosphorus and red phosphorus its black flaky appearance is similar to graphitic carbon. Compound forms of phosphorus include phosphates and phosphides. Phosphorous was first recognized as an element by Hennig Brand in 1669 its name (phosphorus mirabilis, or "bearer of light") was inspired from the brilliant glow emitted by its distillation.

Elemental PotassiumSee more Potassium products. Potassium (atomic symbol: K, atomic number: 19) is a Block S, Group 1, Period 4 element with an atomic weight of 39.0983. The number of electrons in each of Potassium's shells is [2, 8, 8, 1] and its electron configuration is [Ar] 4s1. The potassium atom has a radius of 227.2 pm and a Van der Waals radius of 275 pm. Potassium was discovered and first isolated by Sir Humphrey Davy in 1807. Potassium is the seventh most abundant element on earth. It is one of the most reactive and electropositive of all metals and rapidly oxidizes. As with other alkali metals, potassium decomposes in water with the evolution of hydrogen because of its reacts violently with water, it only occurs in nature in ionic salts.Potassium Bohr Model In its elemental form, potassium has a silvery gray metallic appearance, but its compounds (such as potassium hydroxide) are more frequently used in industrial and chemical applications. The origin of the element's name comes from the English word 'potash,' meaning pot ashes, and the Arabic word qali, which means alkali. The symbol K originates from the Latin word kalium.


September 23, 2018
Los Angeles, CA
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