Potassium Hydrogen Phosphate

CAS 7758-11-4

Product Product Code Order or Specifications
(2N) 99% Potassium Hydrogen Phosphate K-HPAT-02 Contact American Elements
(2N5) 99.5% Potassium Hydrogen Phosphate K-HPAT-025 Contact American Elements
(3N) 99.9% Potassium Hydrogen Phosphate K-HPAT-03 Contact American Elements
(3N5) 99.9% Potassium Hydrogen Phosphate K-HPAT-035 Contact American Elements
(4N) 99.99% Potassium Hydrogen Phosphate K-HPAT-04 Contact American Elements
(5N) 99.999% Potassium Hydrogen Phosphate K-HPAT-05 Contact American Elements

Formula CAS No. PubChem SID PubChem CID MDL No. EC No IUPAC Name Beilstein
Re. No.
K2HPO4 7758-11-4 134989988 24450 MFCD00011383 231-834-5 dipotassium; hydrogen phosphate N/A [K+].[K+].[O-]

PROPERTIES Compound Formula Mol. Wt. Appearance Melting Point Boiling Point Density

Exact Mass

Monoisotopic Mass Charge MSDS
K2HPO4 174.18 Colorless to white crystals N/A N/A N/A 173.888659 173.888659 0 Safety Data Sheet

Phosphate IonPotassium Hydrogen Phosphate is generally immediately available in most volumes. High purity, submicron and nanopowder forms may be considered. 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 (K) atomic and molecular weight, atomic number and elemental symbol Elemental PotassiumPotassium (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. Potassium Bohr ModelAs 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. 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'. For more information on potassium, including properties, safety data, research, and American Elements' catalog of potassium products, visit the Potassium Information Center.

Phosphorus(P) atomic and molecular weight, atomic number and elemental symbolPhosphorus Bohr ModelPhosphorus (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. For more information on phosphorus, including properties, safety data, research, and American Elements' catalog of phosphorus products, visit the Phosphorus Information Center.

Material Safety Data Sheet MSDS
Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
Risk Codes N/A
Safety Precautions N/A
RTECS Number N/A
Transport Information N/A
WGK Germany 3
Globally Harmonized System of
Classification and Labelling (GHS)

Di-potassium monohydrogen phosphate; Potassium phosphate dibasic; Dipotassium hydrogen phosphate; Dipotassium hydrogenphosphate; Potassium hydrogen phosphate (2:1:1); Potassium phosphate, dibasic, Potassium dibasic phosphate, sec.-Potassium phosphate, Dipotassium monophosphate, Dipotassium orthophosphate, Potassium monohydrogen phosphate, Potassium monophosphate, Dipotassium-O-phosphate

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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 Material Safety Data Sheet (MSDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes.

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Production Catalog Available in 36 Countries & Languages

Recent Research & Development for Potassium

  • Jorge Omar Gil Posada, Peter J. Hall, Post-hoc comparisons among iron electrode formulations based on bismuth, bismuth sulphide, iron sulphide, and potassium sulphide under strong alkaline conditions, Journal of Power Sources, Volume 268, 5 December 2014
  • Renan Azevedo da Rocha, Carolina Leão Quintanilha, Thayná Viana Lanxin, Júlio Carlos Afonso, Cláudio Augusto Vianna, Valdir Gante, José Luiz Mantovano, Production of potassium manganate and barium manganate from spent zinc–MnO2 dry cells via fusion with potassium hydroxide, Journal of Power Sources, Volume 268, 5 December 2014
  • Kaiyou Zhang, Hong Chen, Xue Wang, Donglin Guo, Chenguo Hu, Shuxia Wang, Junliang Sun, Qiang Leng, Synthesis and structure determination of potassium copper selenide nanowires and solid-state supercapacitor application, Journal of Power Sources, Volume 268, 5 December 2014
  • Elena Yazhenskikh, Tatjana Jantzen, Klaus Hack, Michael Müller, Critical thermodynamic evaluation of oxide systems relevant to fuel ashes and slags: Potassium oxide–magnesium oxide–silica, Calphad, Volume 47, December 2014
  • Qingxin Meng, Xiangda Meng, Huishun Chen, Zhongxiang Zhou, Changes in the electroholographic properties of a paraelectric potassium lithium tantalate niobate crystal by electrostriction, Optics Communications, Volume 331, 15 November 2014
  • Hongyan Ma, Biwan Xu, Zongjin Li, Magnesium potassium phosphate cement paste: Degree of reaction, porosity and pore structure, Cement and Concrete Research, Volume 65, November 2014
  • Xiaojing Cheng, Jiagang Wu, Ting Zheng, Xiaopeng Wang, Binyu Zhang, Dingquan Xiao, Jianguo Zhu, Xiangjian Wang, Xiaojie Lou, Rhombohedral–tetragonal phase coexistence and piezoelectric properties based on potassium–sodium niobate ternary system, Journal of Alloys and Compounds, Volume 610, 15 October 2014
  • Yulin Yang, Jian Ma, Xiaowen Qi, Xiangshuai Meng, Fabrication of nano serpentine-potassium acetate intercalation compound and its effect as additive on tribological properties of the fabric self-lubricating liner, Wear, Volume 318, Issues 1–2, 15 October 2014
  • Tangyuan Li, Huiqing Fan, Changbai Long, Guangzhi Dong, Sheji Sun, Defect dipoles and electrical properties of magnesium B-site substituted sodium potassium niobates, Journal of Alloys and Compounds, Volume 609, 5 October 2014
  • Caijun Shi, Jianming Yang, Nan Yang, Yuan Chang, Effect of waterglass on water stability of potassium magnesium phosphate cement paste, Cement and Concrete Composites, Volume 53, October 2014
  • F. Askari, E. Ghasemi, B. Ramezanzadeh, M. Mahdavian, Mechanistic approach for evaluation of the corrosion inhibition of potassium zinc phosphate pigment on the steel surface: Application of surface analysis and electrochemical techniques, Dyes and Pigments, Volume 109, October 2014
  • Yawen Wang, Fangfang Duo, Shiqi Peng, Falong Jia, Caimei Fan, Potassium iodate assisted synthesis of titanium dioxide nanoparticles with superior water-dispersibility, Journal of Colloid and Interface Science, Volume 430, 15 September 2014
  • Il Seok Chae, Miso Kim, Yong Soo Kang, Sang Wook Kang, Enhanced CO2 carrier activity of potassium cation with fluorosilicate anions for facilitated transport membranes, Journal of Membrane Science, Volume 466, 15 September 2014
  • H. Bahri, I. Danaee, G.R. Rashed, The effect of curing time and curing temperature on the corrosion behavior of nanosilica modified potassium silicate coatings on AA2024, Surface and Coatings Technology, Volume 254, 15 September 2014
  • Takuya Wada, Takuya Yasutake, Akira Nakasuga, Taro Kinumoto, Tomoki Tumura, Masahiro Toyoda, Preparation of few-layer graphene by the hydroxylation of a potassium–graphite intercalation compound, Carbon, Volume 76, September 2014
  • Wenjuan Wu, Jing Li, Dingquan Xiao, Min Chen, Yingchun Ding, Chuanqi Liu, Defect dipoles-driven ferroelectric behavior in potassium sodium niobate ceramics, Ceramics International, Volume 40, Issue 8, Part B, September 2014
  • Yongshan Tan, Hongfa Yu, Ying Li, Chengyou Wu, Jinmei Dong, Jing Wen, Magnesium potassium phosphate cement prepared by the byproduct of magnesium oxide after producing Li2CO3 from salt lakes, Ceramics International, Volume 40, Issue 8, Part B, September 2014
  • Xiaoxin Zhang, Qingzhi Yan, Shaoting Lang, Min Xia, Changchun Ge, Basic thermal–mechanical properties and thermal shock, fatigue resistance of swaged + rolled potassium doped tungsten, Journal of Nuclear Materials, Volume 452, Issues 1–3, September 2014
  • J.X. Liao, X.B. Wei, Z.Q. Xu, P. Wang, Effect of potassium-doped concentration on structures and dielectric performance of barium-strontium-titanate films, Vacuum, Volume 107, September 2014
  • Rui-Tao Wen, Gunnar A. Niklasson, Claes G. Granqvist, Electrochromic nickel oxide films and their compatibility with potassium hydroxide and lithium perchlorate in propylene carbonate: Optical, electrochemical and stress-related properties, Thin Solid Films, Volume 565, 28 August 2014

Recent Research & Development for Phosphates

  • Ercan Avci, Enhanced cathode performance of nano-sized lithium iron phosphate composite using polytetrafluoroethylene as carbon precursor, Journal of Power Sources, Volume 270, 15 December 2014
  • Yuexia Yang, Wenwen Xu, Ruisong Guo, Lan Liu, Shanshan Wang, Dong Xie, Yizao Wan, Synthesis and electrochemical properties of Zn-doped, carbon coated lithium vanadium phosphate cathode materials for lithium-ion batteries, Journal of Power Sources, Volume 269, 10 December 2014
  • Zhipeng Ma, Guangjie Shao, Xiujuan Qin, Yuqian Fan, Guiling Wang, Jianjun Song, Tingting Liu, Ionic conductor cerous phosphate and carbon hybrid coating LiFePO4 with improved electrochemical properties for lithium ion batteries, Journal of Power Sources, Volume 269, 10 December 2014
  • Sathasivam Pratheep Kumar, Buvaneswari Gopal, Synthesis and leachability study of a new cesium immobilized langbeinite phosphate: KCsFeZrP3O12, Journal of Alloys and Compounds, Volume 615, 5 December 2014
  • Si-yao Guo, Song Han, Constructing a novel hierarchical 3D flower-like nano/micro titanium phosphate with efficient hydrogen evolution from water splitting, Journal of Power Sources, Volume 267, 1 December 2014
  • Pingxue Li, Yifei Yao, Junjie Chi, Haowei Hu, Chun Yang, Ziqiang Zhao, Guangju Zhang, 980 nm all-fiber NPR mode-locking Yb-doped phosphate fiber oscillator and its amplifier, Optics Communications, Volume 332, 1 December 2014
  • Tsuyoshi Honma, Atsushi Sato, Noriko Ito, Takuya Togashi, Kenji Shinozaki, Takayuki Komatsu, Crystallization behavior of sodium iron phosphate glass Na2 - xFe1 + 0.5xP2O7 for sodium ion batteries, Journal of Non-Crystalline Solids, Volume 404, 15 November 2014
  • Aleksandra Matraszek, Irena Szczygiel, Bogdan Szczygiel, Hydrothermal synthesis and characterization of Na3Y(PO4)2 phosphate, Journal of Alloys and Compounds, Volume 612, 5 November 2014
  • Hongyan Ma, Biwan Xu, Zongjin Li, Magnesium potassium phosphate cement paste: Degree of reaction, porosity and pore structure, Cement and Concrete Research, Volume 65, November 2014
  • A. Venkateswara Rao, V. Veeraiah, A.V. Prasada Rao, B. Kishore Babu, K.Vijaya Kumar, Influence of Zr4+ doping on structural, spectroscopic and conductivity studies of lithium titanium phosphate, Ceramics International, Volume 40, Issue 9, Part A, November 2014
  • Chengbin Cao, Hao Li, Jun Li, Chen Liu, Huilin Yang, Bin Li, Mechanical reinforcement of injectable calcium phosphate cement/silk fibroin (SF) composite by mineralized SF, Ceramics International, Volume 40, Issue 9, Part A, November 2014
  • Chi-Jen Shih, Pei-Shan Lu, Wen-Cheng Chen, Yeo-Wan Chiang, Chi-Sheng Chien, Evaluation of gentamicin encapsulated hierarchically meso-macroporous silica-based calcium phosphates glass powders, Ceramics International, Volume 40, Issue 9, Part B, November 2014
  • Emerson Colonetti, Eduardo Hobold Kammer, Agenor De Noni Junior, Chemically-bonded phosphate ceramics obtained from aluminum anodizing waste for use as coatings, Ceramics International, Volume 40, Issue 9, Part A, November 2014
  • Toshiki Miyazaki, Toru Tanaka, Yuki Shirosaki, Masakazu Kawashita, Yttrium phosphate microspheres with enriched phosphorus content prepared for radiotherapy of deep-seated cancer, Ceramics International, Volume 40, Issue 9, Part B, November 2014
  • Andrea Bencini, Francesco Bartoli, Claudia Caltagirone, Vito Lippolis, Zinc(II)-based fluorescent dyes: Luminescence modulation by phosphate anion binding, Dyes and Pigments, Volume 110, November 2014
  • Wanying Geng, Ge Zhu, Yurong Shi, Yuhua Wang, Luminescent characteristics of Dy3+ doped calcium zirconium phosphate CaZr4(PO4)6 (CZP) phosphor for warm-white LEDs, Journal of Luminescence, Volume 155, November 2014
  • Giulia Broglia, Consuelo Mugoni, Jincheng Du, Cristina Siligardi, Monia Montorsi, Lithium vanado-phosphate glasses: Structure and dynamics properties studied by molecular dynamics simulations, Journal of Non-Crystalline Solids, Volume 403, 1 November 2014
  • P. Rajesh, Urit Charoen In, Prapun Manyum, P. Ramasamy, Effect of the purity of starting materials on the growth and properties of potassium dihydrogen phosphate single crystals – A comparative study, Materials Research Bulletin, Volume 59, November 2014
  • Yakub Fam, Toyoko Imae, Jonathan Miras, Maria Martinez, Jordi Esquena, pH-dependent loading of Pt nanoparticles protected by dendrimer in calcium phosphate matrices, Microporous and Mesoporous Materials, Volume 198, 1 November 2014
  • Chun-Xiao Liu, Jun Xu, Wei-Nan Li, Xiao-Li Xu, Hai-Tao Guo, Wei Wei, Gen-Gen Wu, Yue Hu, Bo Peng, Fabrication and annealing optimization of oxygen-implanted Yb3+-doped phosphate glass planar waveguides, Optics & Laser Technology, Volume 63, November 2014