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Introduction Solubility in water Uses Toxicity
Potassium dihydrogen phosphate
Potassium dihydrogen phosphate structure
Chemical Name:
Potassium dihydrogen phosphate
Molecular Formula:
Formula Weight:
MOL File:

Potassium dihydrogen phosphate Properties

Melting point:
252.6 °C(lit.)
2.338 g/mL at 25 °C(lit.)
storage temp. 
Store at RT.
H2O: 1.5 M at 20 °C, clear, colorless
White transparent
Specific Gravity
4.2-4.6 (20g/l, H2O, 20℃)
(1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)
Water Solubility 
222 g/L (20 ºC)
λ: 260 nm Amax: 0.046
λ: 280 nm Amax: 0.040
CAS DataBase Reference
7778-77-0(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System
Monopotassium phosphate (7778-77-0)
  • Risk and Safety Statements
Hazard statements  H313-H315-H319
Precautionary statements  P264-P280a-P305+P351+P338-P321-P332+P313-P337+P313
Hazard Codes 
Risk Statements 
Safety Statements 
Toxicity LD50 skin in rabbit: > 4640mg/kg
NFPA 704
1 0

Potassium dihydrogen phosphate price More Price(119)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 04243 Potassium phosphate monobasic meets analytical specification of Ph. Eur., NF, E340, anhydrous, 98-100.5% (calc. to the dried substance) 7778-77-0 1kg $103 2019-12-02 Buy
Sigma-Aldrich 04243 Potassium phosphate monobasic meets analytical specification of Ph. Eur., NF, E340, anhydrous, 98-100.5% (calc. to the dried substance) 7778-77-0 6x1kg $231 2019-12-02 Buy
Alfa Aesar 010840 Potassium dihydrogen phosphate, Puratronic?, 99.999% (metals basis), Si 10ppm max 7778-77-0 100g $782 2019-12-02 Buy
Alfa Aesar 010840 Potassium dihydrogen phosphate, Puratronic?, 99.999% (metals basis), Si 10ppm max 7778-77-0 25g $225 2019-12-02 Buy
Strem Chemicals 93-1939 Potassium dihydrogen phosphate, 99+% (ACS) 7778-77-0 250g $34 2019-12-02 Buy

Potassium dihydrogen phosphate Chemical Properties,Uses,Production


Potassium dihydrogen phosphate is a kind of highly efficient and rapid dissolving phosphorus and potassium compound fertilizer containing, phosphorus and potassium, two elements for providing the necessary nutrients for plant growth and development, being applicable to any soil and crop, especially being applicable to the treatment of regions of simultaneous lack of phosphorus and potassium nutrients and phosphorus-preferred and potassium-preferred crops. It is mostly used for root top dressing, seed soaking, and seed dressing, being able to yield significant effect. If it sued for the roots fertilization, it can be used as basal fertilizer, seed fertilizer or moderate-late phase topdressing.
Its aqueous solution can react with silver nitrate, generating yellow phosphorus dihydrogen phosphate precipitation, being able to be used as a differential reaction.
As potassium dihydrogen phosphate is expensive, there is less agricultural production. Therefore, it is generally applied of the soaking or root top dressing for application. For crop soaking, the commonly used concentration is 0.2%. After dipping 18~20h, the field can be sown after drying. For root top dressing, if spraying alone, the highest concentration can be 0.5%. If within the range of jointing-booting stage of wheat and rice, we can spray for 1 or 2 times during the cotton, rape early flowering phase. Upon spraying 2 times, the interval can be about 7 to 10 days with the liquid usage amount per acre being about 100~150kg. It can also be combined with other nutrients to be formulated into compound nutrition for foliage top-dressing. For example, the leaf fertilizer used for field crops in North China has its main ingredient be exactly potassium dihydrogen phosphate, urea and the addition inclusion of some trace elements. In recent years, the use of blade complex nutrition also mostly adopts the potassium dihydrogen phosphate as a high concentration and excellent hydrophilic phosphate and potassium fertilizer source. With the development of facilities of horticultural crops and drip irrigation, fertilizer irrigation, the increasing daily demand for potassium dihydrogen phosphate is also increasing.

Solubility in water

Dissolved grams per 100 ml of water at different temperatures (° C):
14.8 g/0 ° C; 18.3 g/10 ° C; 22.6 g/20 ° C; 28 g/30 ° C; 35.5 g /
50.2 g/60 ° C; 70.4 g/80 ° C; 83.5 g/90 ° C


(1) As feed phosphorus additives; In the food industry, it is used for the manufacture of baked goods, for leavening agent, flavoring agent, fermentation additives, nutritional fortifiers, yeast food. Also used as a buffer, chelating agent.
(2) It can be used as fertilizer, flavoring agent and the culture agent of brewing yeast; used for the preparation of buffer solution, also used in medicine and manufacturing of potassium metaphosphate.
(3) It can be used for the fertilization of rice, wheat, cotton, rape, tobacco, sugar cane, apple and other crops.
(4) It can be used as chromatography reagents and buffer, but also for the synthesis of medicine.
As a highly efficient fertilizer, it is suitable for all kinds of soil and crops. It can also used as a bacterial culture agent, the flavoring agent for the synthesis of sake and the raw material for making potassium metaphosphate. In medicine, it is used for the uric acidification as a nutritional agent.
(5) Used as feed nutritional supplements;As a quality improver, it has effects of improving the complexation metal ions and pH value, increasing the ionic strength of food, and thus improving the adhesion and water holding capacity of food. China provides that it can be used for wheat flour with the maximum usage amount of 5.0g/kg and 2.0 g/kg in the beverage.


Adl: 0 to 70 mg/kg (calculated as phosphorus, FA0 HO, 1985). It is generally recognized as being safe (US Food and Drug Administration, 1975). Cooked meat, cooked ham, cooked minced meat: 3 g/kg; low concentration milk, sweet condensed milk, cream 2 g/kg; milk powder, cream powder 5 g/kg; processed cheese 9 g/kg; quick-frozen Haddock, perch, ferret fish, hake fillet 5 g/kg; ready-to-eat broth, soup 1000 mg/kg; cold drink 2 g/kg. Adl: 0 to 70 mg/kg (total phosphate, in terms of phosphorus; FAO/WHO, 2001). ADI: no restriction (EEC, 1990).

Chemical Properties

White powder


Buffer solutions


In buffers for determination of pH. Pharmaceutic aid (buffering agent).


potassium phosphate is a humectant and pH adjuster used in cosmetic formulations. Potassium phosphate is an inorganic salt.


Potassium Dihydrogen is a buffer, neutralizing agent, and sequestrant. It is mildly acid, with a ph of 4.5, and fairly soluble in water, with a solubility of 25 g in 100 ml at 25°c. It is used in whole eggs for color preservation and is also used in low-sodium products, milk products, and meat products. Typical usage ranges from 0.1 to 0.5%. It is also termed monopotassium phosphate or thophosphate, potassium phosphate monobasic, and monopotassium monophosphate.

Purification Methods

Dissolve it in boiling distilled water (2mL/g), keep on a boiling water-bath for several hours, then filter it through paper pulp to remove any turbidity. Cool rapidly with constant stirring, and the crystals are collected on to hardened filter paper, using suction, washed twice with ice-cold water, once with 50% EtOH, and dried at 105o. Alternative crystallisations are from water, then 50% EtOH, and again water, or from concentrated aqueous solution by addition of EtOH. It is freed from traces of Cu by extracting its aqueous solution with diphenylthiocarbazone in CCl4, followed by repeated extraction with CCl4 to remove traces of diphenylthiocarbazone.

Potassium dihydrogen phosphate Preparation Products And Raw materials

Raw materials

Preparation Products

Potassium dihydrogen phosphate Suppliers

Global( 529)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
[email protected] CHINA 21806 58
Jiangsu Kolod Food Ingredients Co.,Ltd.
+86-518-85110578 18805133257
+86-518-85110578 [email protected] CHINA 100 60
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 [email protected] CHINA 22631 55
Hangzhou FandaChem Co.,Ltd.
0086 158 5814 5714 (Mobile
+86-571-56059825 [email protected] CHINA 2991 55
Shanghai Yingrui Biopharma Co., Ltd.
+86-21-33585366 E-mail:[email protected]
+86-21-34979012 [email protected] CHINA 739 60
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 [email protected] China 1892 55
Hebei Chisure Biotechnology Co., Ltd.
0311 66567340 [email protected] CHINA 1012 58
Shanghai Zheyan Biotech Co., Ltd.
[email protected] CHINA 3623 58
career henan chemical co
[email protected] CHINA 30054 58
Hebei Ruishun Trade Co.,LTD
[email protected] CHINA 302 58

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View Lastest Price from Potassium dihydrogen phosphate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-11-21 Potassium dihydrogen phosphate
US $4.00 / KG 1KG 99% 10T Henan Xiangtong Chemical Co., Ltd.
2019-07-05 Potassium dihydrogen phosphate; mkp; kh2po4
US $10.00 / KG 1KG 99% 10 mt Hebei Guanlang Biotechnology Co., Ltd.
2019-07-21 Potassium Phosphate Monobasic MKP Fertilizer
US $1.00 / KG 1KG 99% 30000 Metric Ton/Metric Tons per Year MKP Cangzhou Wanyou New Material Technology Co.,Ltd

Potassium dihydrogen phosphate Spectrum

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