Potassium Phosphate Offered in two grades namely Commercial Pure Grade and Extra Pure BP IP USP FCC Analytical Reagent Grade.

Genearl Specifications of Monobasic Potassium Phosphate Monobasic Monopotassium Phosphate
Monopotassium Phosphate Specifications

Potassium Dihydrogen Phosphate BP
Monopotassium Phosphate BP
Potassium Phosphate Monobasic BP
KH2PO4 -- 136.1 -- 7778-77-0
Monobasic Potassium Phosphate BP
Potassium Phosphate Monobasic BP

DEFINITION
Potassium dihydrogen phosphate contains not less than 98.0 per cent and not more than the equivalent of 100.5 per cent of KH2PO4, calculated with reference to the dried substance.

CHARACTERS
A white, crystalline powder or colourless crystals, freely soluble in water, practically insoluble in alcohol.

IDENTIFICATION
A. Solution S (see Tests) is faintly acid.
B. Solution S gives reaction (b) of phosphates.
C. 0.5 ml of solution S gives reaction of potassium.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: To 5 ml of solution S add 5 ml of carbon dioxide-free water. The pH of the solution is 4.2 to 4.5.
Reducing substances: To 5 ml of solution S add 5 ml of dilute sulphuric acid and 0.25 ml of 0.02 M potassium permanganate. Heat on a water-bath for 5 min. The colour of the permanganate is not completely discharged.
Chlorides: Dilute 2.5 ml of solution S to 15 ml with water R. The solution complies with the limit  test for chlorides (200 ppm).
Sulphates: To 5 ml of solution S add 0.5 ml of hydrochloric acid and dilute to 15 ml with  distilled water. The solution complies with the limit test for sulphates (300 ppm).
Arsenic: 0.5 g complies with limit test A for arsenic (2 ppm).
Iron: 10 ml of solution S complies with the limit test for iron (10 ppm).
Sodium: If intended for use in the manufacture of parenteral dosage forms, it complies with the  test for sodium. Not more than 0.1 per cent of Na, determined by atomic emission spectrometry
Heavy metals: 12 ml of solution S complies with limit test A for heavy metals (10 ppm).
Loss on drying: Not more than 2.0 per cent, determined on 1.000 g by drying in an oven at 125C to 130C.

Potassium Phosphate Monobasic FCC Food Grade
Potassium Biphosphate; Potassium Dihydrogen Phosphate
Monopotassium Phosphate FCC
Monobasic Potassium Phosphate FCC
KH2PO4 Formula wt 136.09
INS: 340(i) CAS: [7778-77-0]

DESCRIPTION
Potassium Phosphate, Monobasic, occurs as colorless crystals or as a white, granular or crystalline powder. It is stable in air. It is freely soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is between 4.2 and 4.7.
Function: Buffer; sequestrant; yeast food.

REQUIREMENTS
Identification: A 1:20 aqueous solution gives positive tests for Potassium and for Phosphate.
Assay: Not less than 98.0% of KH2PO4 after drying.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 10 mg/kg.
Insoluble Substances: Not more than 0.2%.
Lead: Not more than 2 mg/kg.
Loss on Drying: Not more than 1%.

Potassium Phosphate Monobasic Analytical Reagent
Potassium Dihydrogen Phosphate
Monopotassium Phosphate
Monobasic Potassium Phosphate
KH2PO4
Formula Wt 136.09
CAS Number 7778-77-0

REQUIREMENTS
Assay: 99.0% KH2PO4
pH of a 5% solution: 4.1-4.5 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.01%
Loss on drying at 105C: 0.2%
Chloride (Cl): 0.001%
Nitrogen compounds (as N): 0.001%
Sulfate (SO4): 0.003%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.002%
Sodium (Na): 0.005%

Please visit Monopotassium phosphate or Monobasic potassium phosphate monobasic IP BP USP FCC for specification.

Mono potassium phosphate MKP (also potassium dihydrogen phosphate, KDP, or monobasic potassium phosphate, MKP or potassium phosphate monobasic) -- KH2PO4 -- is a soluble salt which is used as a fertilizer, a food additive and a fungicide. Mono potassium phosphate is a source of phosphorus and potassium. Mono potassium phosphate is also a buffering agent. When used in fertilizer mixtures with urea and ammonium phosphates, Mono potassium phosphate minimizes escape of ammonia by keeping the pH at a relatively low level.

Potassium Phosphate - Monobasic: Potassium biphosphate or acid phosphate; potassium dihydrogen phosphate; mono potassium phosphate. KH2PO4; mol. wt. 136.09. Colorless crystals or white, granular powder; permanent in air; at 400° loses H2O, forming metaphosphate. d. 2.34. Soluble in about 4.5 parts water; insoluble in alcohol. pH: 4.4-4.7.

Use: In buffers for determination of pH.

MKP is used to prevent calcium kidney stones. It  is also used to decrease the amount of ammonia in urine, thereby reducing odor and skin irritation caused by high-ammonia urine. This medication is also given to help certain antibiotics for bladder infectionswork better.

Fertilizer grade MKP contains the equivalent of 52% P2O5 and 34% K2O, and is labeled 0-52-34. MKP is often used as a nutrient source in the greenhouse trade and in hydroponics.

MKP is one of the components of Gatorade and is used as an additive in cigarettes.

At 400°C it decomposes, by loss of water, to potassium metaphosphate (KPO3)

As a crystal, MKP is noted for its non-linear optical properties. Used in optical modulators and for non-linear optics such as SHG (second harmonic generation).

Also to be noted is KDP, Potassium Dideuterium Phosphate, with slightly different properties. Highly deuterated KDP is used in nonlinear frequency conversion of laser light instead of protonated (regular) KDP due to the fact that the replacement of protons with deuterons in the crystal shifts the third overtone of the strong OH molecular stretch to longer wavelengths, moving it mostly out of the range of the fundamental line at ~1,064nm of neodymium based lasers. Regular KDP has absorbance at this wavelength of around 4.7-6.3%/cm of thickness while highly deuterated KDP has absorbance's of typically less than .8%/cm.

General Specifications of Dibasic Potassium Phosphate Dibasic Disodium Phosphate
Dipotassium Phosphate Specifications

Dipotassium Hydrogen Phosphate BP
Dipotassium Phosphate BP
K2HPO4 -- 174.2 -- 7758-11-4
Dibasic Potassium Phosphate BP
Potassium Phosphate Dibasic BP

DEFINITION
Dipotassium phosphate contains not less than 98.0 per cent and not more than the equivalent of 101.0 per cent of K2HPO4, calculated with reference to the dried substance.

CHARACTERS
A white powder or colourless crystals, very hygroscopic, very soluble in water, very slightly soluble in alcohol.

IDENTIFICATION
A. Solution S (see Tests) is slightly alkaline
B. Solution S gives reaction of phosphates.
C. Solution S gives reaction of potassium.

TESTS
Solution S: Dissolve 5.0 g in distilled water and dilute to 50 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
Reducing substances: Heat on a water-bath for 5 min a mixture of 5 ml of solution S, 5 ml of dilute sulphuric acid and 0.25 ml of 0.02 M potassium permanganate. The solution remains faintly pink.
Chlorides: To 2.5 ml of solution S add 10 ml of dilute nitric acid and dilute to 15 ml with water. The solution complies with the limit test for chlorides (200 ppm).
Sulphates: To 1.5 ml of solution S add 2 ml of dilute hydrochloric acid and dilute to 15 ml with distilled water. The solution complies with the limit test for sulphates (0.1 per cent).
Arsenic: 5 ml of solution S complies with limit test A for arsenic (2 ppm).
Iron: 10 ml of solution S complies with the limit test for iron (10 ppm).
Heavy metals: Dissolve 2.0 g in 8 ml of water. Acidify with about 6 ml of dilute hydrochloric acid (pH 3 to 4) and dilute to 20 ml with water. 12 ml of the solution complies with limit test A for heavy metals (10 ppm).
Sodium: If intended for use in the manufacture of parenteral dosage forms, it contains not more than 0.1 per cent of Na, determined by atomic emission spectrometry.
Loss on drying: Not more than 2.0 per cent, determined on 1.000 g by drying in an oven at 125C to 130C.
Bacterial endotoxins: Less than 1.1 IU/mg, if intended for use in the manufacture of parenteral dosage forms without a further appropriate procedure for the removal of bacterial endotoxins.

Dibasic Potassium Phosphate USP
Dipotassium Phosphate USP
Dibasic Potassium Phosphate USP
Potassium Phosphate Dibasic USP
K2HPO4 174.18
Phosphoric acid, dipotassium salt.
Dipotassium hydrogen phosphate [7758-11-4].

Dibasic Potassium Phosphate contains not less than 98.0 percent and not more than 100.5 percent of K2HPO4, calculated on the dried basis.

Identification: A solution (1 in 20) responds to the tests for Potassium and for Phosphate.
pH: between 8.5 and 9.6, in a solution (1 in 20).
Loss on drying: Dry it at 105 to constant weight: it loses not more than 1.0% of its weight.
Insoluble substances: Dissolve 10 g in 100 mL of hot water, filter through a tarred filtering crucible, wash the insoluble residue with hot water, and dry at 105 for 2 hours: the weight of the residue so obtained does not exceed 20 mg (0.2%).
Carbonate: To 1 g add 3 mL of water and 2 mL of 3 N hydrochloric acid: not more than a few bubbles are evolved.
Chloride: A 1.0-g portion shows no more chloride than corresponds to 0.40 mL of 0.020 N hydrochloric acid (0.03%).
Sulfate: A 0.20-g portion shows no more sulfate than corresponds to 0.20 mL of 0.020 N sulfuric acid (0.1%).
Arsenic: 3 ppm.
Iron: the limit is 0.003%.
Sodium: A solution (1 in 10) tested on a platinum wire imparts no pronounced yellow color to a non-luminous flame.
Heavy metals: the limit is 0.001%.
Limit of fluoride: The limit is 0.001%.
Limit of monobasic or tribasic salt: Dissolve 3 g in 30 mL of water, cool to 20C, and add 3 drops of thymol blue TS: a blue color is produced, which is changed to yellow (with a greenish tinge) by the addition of not more than 0.4 mL of 1 N hydrochloric acid.

Potassium Phosphate Dibasic FCC
Dipotassium Monophosphate, Dipotassium Phosphate FCC Food Grade
Dibasic Potassium Phosphate FCC
K2HPO4 Formula wt 174.18
INS: 340(ii) CAS: [7758-11-4]

DESCRIPTION
Potassium Phosphate, Dibasic, occurs as a colorless or white, granular salt that is deliquescent when exposed to moist air. One gram is soluble in about 3 mL of water. It is insoluble in alcohol. The pH of a 1% solution is about 9.
Function: Buffer; sequestrant; yeast food.

REQUIREMENTS
Identification: A 1:20 aqueous solution gives positive tests for Potassium and for Phosphate.
Assay: Not less than 98.0% of K2HPO4 after drying.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 10 mg/kg.
Insoluble Substances: Not more than 0.2%.
Lead: Not more than 2 mg/kg.
Loss on Drying: Not more than 2.0%.

Potassium Phosphate Dibasic Analytical Reagent
Dibasic Potassium Phosphate
Dipotassium Phosphate
Dipotassium Hydrogen Phosphate
K2HPO4
Formula Wt 174.18
CAS Number 7758-11-4

REQUIREMENTS
Assay: 98.0% K2HPO4
pH of a 5% solution: 8.5-9.6 at 25C

MAXIMUM ALLOWABLE
Insoluble matter: 0.01%
Loss on drying at 105C: 1.0%
Chloride (Cl): 0.003%
Nitrogen compounds (as N): 0.001%
Sulfate (SO4): 0.005%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 0.001%
Sodium (Na): 0.05%.

Potassium Phosphate, Tribasic FCC

Tripotassium Phosphate FCC Food Grade
Tribasic Potassium Phosphate FCC
K3PO4 Formula wt 212.27
INS: 340(iii) CAS: [7778-53-2]

DESCRIPTION
Potassium Phosphate, Tribasic, occurs as white, hygroscopic crystals or granules. It is anhydrous or may contain one molecule of water of hydration. It is freely soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is about 11.5.
Function: Emulsifier.

REQUIREMENTS
Identification: A 1:20 aqueous solution gives positive tests for Potassium and for Phosphate.
Assay: Not less than 97.0% of K3PO4, calculated on the ignited basis.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 10 mg/kg.
Insoluble Substances: Not more than 0.2%.
Lead: Not more than 2 mg/kg.
Loss on Ignition Anhydrous: Not more than 5.0%; Monohydrate: Between 8.0% and 20.0%.