Potassium Phosphate, Dibasic

HCID 24450

Basic information

CAS
7758-11-4
Standard SMILES
O=P([O-])([O-])O.[K+].[K+]
InChIKey
ZPWVASYFFYYZEW-UHFFFAOYSA-L
Molecular formula
K2HPO4
Average molar mass
174.176 g/mol
Monoisotopic mass
173.8886585

Overview

Dipotassium hydrogen phosphate is a potassium salt that is the dipotassium salt of phosphoric acid. It has a role as a buffer. It is an inorganic phosphate and a potassium salt.

Names & identifiers

Preferred name
Potassium Phosphate, Dibasic
IUPAC
dipotassium;hydrogen phosphate
English name
Potassium Phosphate Dibasic
Molecular formula
K2HPO4
Molecular weight
174.18

Names & synonyms

7758-11-4Dipotassium hydrogen phosphateDIPOTASSIUM PHOSPHATEPotassium phosphate dibasicDipotassium hydrogenphosphatePotassium phosphate, dibasicDibasic potassium phosphatePhosphoric acid, dipotassium saltPotassium dibasic phosphateDipotassium monophosphatePotassium monophosphateDipotassium orthophosphate
Show more names
K2HPO4DKPPOTASSIUM HYDROGEN PHOSPHATEDipotassium phosphate anhydrousPOTASSIUM BIPHOSPHATE
Dipotassium monohydrogen phosphateHydrogen dipotassium phosphatePotassium phosphate (dibasic)Dipotassium hydrogenorthophosphatedi-potassium hydrogen phosphateCI71S98N1ZPhosphoric acid, potassium salt (1:2)Dipotassium acid phosphate

Database identifiers

CAS
7758-11-4
PubChem CID
24450
DTXSID
DTXSID8035506
ChEMBL
CHEMBL1200459
ChEBI
CHEBI:131527
UNII
CI71S98N1Z
EC Number
231-834-5
Nikkaji
J43.941J

Properties

Computed structural properties

Topological polar surface area
83.4 Ų
Hydrogen bond donors
1
Hydrogen bond acceptors
4
Rotatable bonds
0
Heavy atoms
7

Experimental & physicochemical properties

Chemical ClassesMetals -> Phosphates, Metallic Salts
Cosmetics · 2 items

Cosmetic ingredients (Dipotassium Phosphate) -> CIR (Cosmetic Ingredient Review)

Buffering

pH · 2 items

Between 8,7 and 9,4 (1 % solution)

PH= 8.8, DETERMINED IN A 1% SOLN

Food AdditivesEMULSIFIER OR EMULSIFIER SALT, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, SEQUESTRANT, STABILIZER OR THICKENER -> FDA Substance added to food
Color/Form · 2 items

White crystals

Colorless or white granules or powder

Solubility · 3 items

Freely soluble in water. Insoluble in ethanol

Very sol in water; 100 g dissolves rapidly & completely in 67 g cold water

Slightly sol in alcohol

Physicochemical properties

Melting point
340 °C · 340 °C
Density
2 · 2,44 g/cm3
bulk density
700 · 700-1000kg/m3
storage temp.
5 °C · Store at +5°C to +30°C.
solubility
2 O: · H2O: 1 M at 20 °C, clear, colorless
form
Solid

Safety & regulation

GHS classification

GHS Classification · 5 items

This chemical does not meet GHS hazard criteria for 48.2% (580 of 1203) of reports.

Danger

H315 (40.7%): Causes skin irritation [Warning Skin corrosion/irritation]

P264, P264+P265, P280, P302+P352, P305+P354+P338, P317, P321, P332+P317, and P362+P364 (click each P-code to see the statement)

Aggregated GHS information provided per 1203 reports by companies from 9 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Hazard information

Regulatory Information · 3 items

Chemical: Phosphoric acid, dipotassium salt

Status: Active Update: 14-03-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/14877

Dipotassium phosphate: Does not have an individual approval but may be used under an appropriate group standard

Other Safety InformationIMAP assessments - Phosphoric acid, dipotassium salt: Human health tier I assessment
Hazards SummaryEmergency treatment: Potassium; Potassium salts are usually not toxic after ingestion in patients with normal renal function. [HSDB] A probable irritant; [CHEMINFO] May cause irritation; [MSDSonline]
FDA Requirements · 3 items

Dipotassium phosphate used as a sequestrant in food for human consumption is generally recognized as safe when used in accordance with good manufacturing practice.

Dipotassium phosphate used as a sequestrant in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice.

Potassium phosphates (mono-, di-, and tribasic) are indirect food additives for use only as a component of adhesives. /Potassium phosphates (mono-, di-, and tribasic)/

Special ReportsWHO; Diseases Caused by Phosphorus and Its Toxic Compounds; Early Detection of Occupational Diseases pg 53-62 (1986). Review of diseases and health related effects resulting from exposure to phosphorus or phosphorus cmpd.
FIFRA Requirements · 2 items

Dipotassium hydrogen phosphate is exempted from the requirement of a tolerance when used as a buffering agent in accordance with good agricultural practice as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops only.

Residues of potassium phosphate are exempted from the requirement of a tolerance when used as a buffer in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest. /Potassium phosphate/

Safety & protection

Storage ConditionsPotassium phosphates injection should be stored at controlled room temperature. /Potassium phosphates/
Disposal Methods · 1 item

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Allowable Tolerances · 2 items

Dipotassium hydrogen phosphate is exempted from the requirement of a tolerance when used as a buffering agent in accordance with good agricultural practice as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops only.

Residues of potassium phosphate are exempted from the requirement of a tolerance when used as a buffer in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest. /Potassium phosphate/

Protective Action Criteria (PAC) · 3 items

17 [mg/m3]

190 [mg/m3]

1100 [mg/m3]

Toxicology

Toxicity Summary · 2 items

The CIR Expert Panel concluded that the following 31 ingredients are safe in the present practices of use and concentration in cosmetics as described in this safety assessment, when formulated to be non-irritating...Dipotassium Phosphate...

Safe for use in cosmetics, with qualifications

Human Toxicity Excerpts · 5 items

ACUTE POTASSIUM INTOXICATION BY MOUTH IS RARE BECAUSE LARGE SINGLE DOSES USUALLY INDUCE VOMITING & BECAUSE IN ABSENCE OF PREEXISTING KIDNEY DAMAGE, POTASSIUM IS RAPIDLY EXCRETED. /POTASSIUM SALTS/

SIDE EFFECTS OF /ORAL/ POTASSIUM SALTS MAY INCLUDE NAUSEA, VOMITING, DIARRHEA, AND ABDOMINAL DISCOMFORT. /POTASSIUM SALTS/

CLINICAL SIGNS AND SYMPTOMS OF /ORAL/ POTASSIUM OVERDOSAGE INCLUDE PARESTHESIAS OF THE EXTREMITIES, LISTLESSNESS, MENTAL CONFUSIONS, WEAKNESS OR HEAVINESS OF THE LEGS, FLACCID PARALYSIS, COLD SKIN, GRAY PALLOR, PERIPHERAL VASCULAR COLLAPSE WITH FALL IN BLOOD PRESSURE, CARDIAC ARRHYTHMIAS, AND HEART BLOCK. /POTASSIUM SALTS/

/IN POTASSIUM POISONING/ RESPIRATIONS ARE INITIALLY ACCELERATED BUT SKELETAL MUSCLE WEAKNESS MAY ADVANCE TO STAGE OF PARALYSIS. /POTASSIUM SALTS/

For more Human Toxicity Excerpts (Complete) data for DIPOTASSIUM PHOSPHATE (6 total), please visit the HSDB record page.

Non-Human Toxicity Excerpts · 5 items

INVESTIGATED BY PLEDGET TECHNIQUE IN 1 ESOPHAGEAL STUDY WITH CATS, PRODUCED EXTENSIVE NECROSIS & ULCERATION. INGESTION MAY PRODUCE OROPHARYNGEAL BURNS, ESOPHAGITIS & GASTRITIS ACCOMPANIED BY ULCERATION, BLEEDING & DIARRHEA.

AFTER ORAL ADMIN OF 0.8 G/KG BODY WT FOR 14 OR 38 WK DOGS VOMITED, WERE CACHECTIC, & HAD ELEVATED CREATININE & BLOOD UREA NITROGEN. RENAL DAMAGE WAS MOST MARKED @ 38 WK, THERE WERE DISSEMINATED ATROPHY (USUALLY OF PROXIMAL TUBLES), FOCAL SCAR TISSUE & NEPHROCALCINOSIS.

ORALLY POISONED ANIMALS DIED FROM RESP FAILURE SOMETIMES FOLLOWING CONVULSIONS & ... GASTROENTERITIS, DEHYDRATION OF ORGANS & EARLY RENAL TUBULAR NECROSIS. /POTASSIUM SALTS/

/ORALLY POISONED ANIMALS/ SURVIVORS HAD ANOREXIA, POLYDIPSIA, POLYURIA, FEVER, CONVULSIVE MOVEMENTS & GI DISTURBANCES DURING FIRST 24 HR, BUT RAPIDLY RECOVERED ... . /POTASSIUM SALTS/

For more Non-Human Toxicity Excerpts (Complete) data for DIPOTASSIUM PHOSPHATE (8 total), please visit the HSDB record page.

Antidote and Emergency Treatment · 2 items

Basic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 6 to 12 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 mL/kg up to 200 mL of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Do not attempt to neutralize. Cover the skin burns with dry sterile dressings after decontamination ... . /Inorganic Bases/Alkaline Corrosives and Related Compounds/

Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious or in respiratory arrest. Early intubation, at the first signs of upper airway obstruction, may be necessary. Positive-pressure ventilation techniques with a bag-valve-mask device may be beneficial. Monitor cardiac rhythm and treat arrhythmias as necessary ... . Start an IV of D5W TKO /SRP: "To keep open", minimal flow rate/. Use lactated Ringer's if signs of hypovolemia are present. Watch for signs of pulmonary edema. For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Consider drug therapy for pulmonary edema ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Inorganic Bases/Alkaline Corrosives and Related compounds/

RAIS Toxicity Values · 4 items

1

PPRTV Current

4

PPRTV Current

Acceptable Daily Intakes · 1 item

FAO/WHO EXPERT COMMITTEE ON FOOD ADDITIVES...RECOMMENDED.../LEVELS/ FOR TOTAL DIETARY PHOSPHORUS...UNCONDITIONAL ACCEPTANCE LEVEL /OF LESS THAN 30 MG/KG BODY WT/ IS CONSIDERED SAFE IN ANY TYPE OF DIET...CONDITIONAL ACCEPTANCE LEVEL /OF 30-70 MG/KG BODY WT/ IS ACCEPTABLE ONLY WHEN DIETARY CALCIUM LEVEL IS HIGH /PHOSPHATES/

Regulatory information

FDA Requirements · 3 items

Dipotassium phosphate used as a sequestrant in food for human consumption is generally recognized as safe when used in accordance with good manufacturing practice.

Dipotassium phosphate used as a sequestrant in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice.

Potassium phosphates (mono-, di-, and tribasic) are indirect food additives for use only as a component of adhesives. /Potassium phosphates (mono-, di-, and tribasic)/

FIFRA Requirements · 2 items

Dipotassium hydrogen phosphate is exempted from the requirement of a tolerance when used as a buffering agent in accordance with good agricultural practice as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops only.

Residues of potassium phosphate are exempted from the requirement of a tolerance when used as a buffer in accordance with good agricultural practices as inert (or occasionally active) ingredients in pesticide formulations applied to growing crops or to raw agricultural commodities after harvest. /Potassium phosphate/

Safety data

F
3
wgk
3
tsca
TSCA listed
rtecs
TC8450000
hs_code
28352400
Toxicity
LD50 orally in Rabbit: 8000 mg/kg

Chemistry & industry

Pharmacology

Bionecessity · 2 items

Phosphate is a major intracellular anion which participates in providing energy for metabolism of substances and contributes to important metabolic and enzymatic reactions in almost all organs and tissues. Phosphate exerts a modifying influence on calcium concentrations, a buffering effect on acid-base equilibrium, and has a major role in the renal excretion of hydrogen ions. /Phosphate/

Phosphate as nutrient is a limiting factor to plant growth. /Phosphate/

Protein BindingPhosphate is minimally protein bound, and highly concentrated in cells (intracellular concentrations are 100-fold higher than serum concentrations). Concentrations of phosphate in plasma are higher in children than in adults.
Pharmacodynamics · 1 item

Phosphate is a major intracellular anion which participates in providing energy for metabolism of substances and contributes to important metabolic and enzymatic reactions in almost all organs and tissues. Phosphate exerts a modifying influence on calcium concentrations, a buffering effect on acid-base equilibrium, and has a major role in the renal excretion of hydrogen ions.

Mechanism of Action · 2 items

Once phosphate gains access to the body fluids and tissues, it exerts little pharmacological effect. If the ion is introduced into the intestine, the absorbed phosphate is rapidly excreted. If large amounts are given by this route, much of it may escape absorption. Because this property leads to a cathartic action, phosphate salts are employed as mild laxatives.

Once phosphate gains access to the body fluids and tissues, it exerts little pharmacological effect. If the ion is introduced into the intestine, the absorbed phosphate is rapidly excreted. If large amounts are given by this route, much of it may escape absorption. Because this property leads to a cathartic action, phosphate salts are employed as mild laxatives. Inorganic phosphate poisoning following ingestion of laxatives that contain phosphate salts has been reported in adults and children. Ingestion of large amounts of sodium dihydrogen phosphate lowers urinary pH. If excessive phosphate salts are introduced intravenously or orally, they may prove toxic by reducing the concentration of Ca 2+ in the circulation and from the precipitation of calcium phosphate in soft tissues. /Phosphates/

Biological Half-LifeIn healthy children with phosphate overdose, half-life was 4.8 to 10.6 hours, and was prolonged to 17 hours in a child with renal insufficiency.
Metabolism/MetabolitesPhosphate is a major intracellular anion which participates in providing energy for metabolism of substances and contributes to important metabolic and enzymatic reactions in almost all organs and tissues.

Uses & manufacturing

Uses · 6 items

CIR ingredient: Dipotassium Phosphate

Used as a buffering agent and corrosion inhibitor in anti-freeze, a culture nutrient for the production of antibiotics, a sequestrant, an emulsifier in cheeses, and a buffer in coffee creamers; Also used in specialty fertilizers, paper-processing aids, and saline cathartics; [HSDB] Used as yeast nutrient, humectant, and laboratory reagent; [CHEMINFO]

Pulp and Paper Processing [Category: Industry]

Buffering agent in anti-freeze; nutrient in the culturing of antibiotics

Sequestrant; emulsifier in specified cheeses

Most of the commercial output of dipotassium phosphate is used in conjunction with borates, nitrites, nitrates, and/or silicates as corrosion inhibitor systems in ethylene glycol antifreeze formulations. Its second largest use is as a buffer in coffee creamers to prevent casein protein precipitation by coffee acids. Other uses include specialty fertilizers, paper-processing aids, and saline cathartics.

U.S. Production · 2 items

(1973) PROBABLY GREATER THAN 5X10+9 G (USE)

(1975) 4.54-6.36X10+9 GRAMS (SUPPLY)

Consumption Patterns68-70% AS A CORROSION INHIBITOR FOR ANTIFREEZE; 29-30% AS A BUFFERING AGENT FOR COFFEE CREAMERS; MINOR AMOUNTS USED IN PAPER PROCESSING, AS FERTILIZER, AS YEAST NUTRIENT, IN PHARMACEUTICALS, & AS CHEMICAL REAGENTS (1973)
Methods of ManufacturingBY REACTING POTASSIUM CARBONATE OR POTASSIUM HYDROXIDE WITH PHOSPHORIC ACID.
Formulations/Preparations · 3 items

INJECTION, 2 MEQ OF POTASSIUM ION AND 1 MEQ OF HYDROGEN PHOSPHATE ION PER ML WITH BENZYL ALCOHOL 0.9%; 30 ML VIALS; POWDER NATIONAL FORMULARY.

Grades: commercial; pure; highest purity; NF /National Formulary/; FCC /Food Chemicals Codex/

Solid and 50% active solution

Household ProductsInformation on 6 consumer products that contain Dipotassium phosphate in the following categories is provided:
Applications · 6 items

DescriptionPotassium Phosphate Dibasic is a common source of phosphorus and potassium, which is often used as a fertilizer. It is also widely applied in the food industry, such as food additive and electrolyte replenisher for workout supplement. Another usage of Potassium Phosphate Dibasic is as a medicine, who serves as a diuretic or laxative. Besides, it is employed in the production of imitation dairy creamers to prevent coagulation and used in certain powders to prepare beverages. In addition, it is commonly seen in chemical laboratories for producing buffer solutions and trypticase soy agar which is used to make agar plates for culturing bacteria.

UsesBuffering agent in antifreeze solutions; nutrient in the culturing of antibiotics; ingredient of instant fertilizers; as sequestrant in the preparation of non-dairy powdered coffee creams.

UsesPotassium Phosphate Dibasic is used as a buffering agent to control the degree of acidity in solutions.

UsesPotassium Phosphate Dibasic is the dipotassium salt of phosphoric acid which functions as a stabilizing salt, buffer, and sequestrant. It is mildly alkaline with a ph of 9 and is soluble in water with a solubility of 170 g/100 ml of water at 25°c. It improves the colloidal solubility of proteins. It acts as a buffer against variation in ph. For example, it is used in coffee whiteners as a buffer against ph variation in hot coffee and to prevent feathering. It also functions as an emulsifier in specified cheeses and as a buffering agent for processed foods. It is also termed dipotassium monohydrogen orthophosphate and dipotassium monophosphate.

UsesBuffer solutions.

General DescriptionPotassium phosphate dibasic is a useful biological buffer having a pH in the range of 8.5-9.6. Potassium phosphate is present in various forms: monobasic (KH2PO4), dibasic (KH2PO4), and tribasic (K3PO4). Potassium phosphate buffers are widely employed in equilibrium dialysis, high performance liquid chromatography (HPLC) and affinity capillary electrophoresis studies.

Preparation methods

PreparationDipotassium phosphate is prepared by partial neutralization of phosphoric acid with potassium hydroxide, followed by crystallization:H3PO4+ 2KOH →K2HPO4+ 2H2O.

Suppliers100 total

国药集团化学试剂有限公司86-21-63210123 · [email protected]
北京华美互利生物化工010-56205725 · [email protected]
上海阿拉丁生化科技股份有限公司400-6206333 13167063860 · [email protected]
上海炎泽化工有限公司15345144255 19975051755 · [email protected]
河北创海生物科技有限公司+86-86-13131129325 · [email protected]

Additional notes

DefinitionChEBI: A potassium salt that is the dipotassium salt of phosphoric acid.

Related reactions

567 records

Compound notes

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