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Potassium phosphate

Product Name:
Potassium phosphate
CAS No.
7778-53-2
Chemical Name:
Potassium phosphate
CBNumber:
CB7206120
Molecular Formula:
K3PO4
Formula Weight:
212.266261
MOL File:
7778-53-2.mol
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Potassium phosphate Property

Melting point:
1340 °C
Density 
2.564 g/mL at 25 °C(lit.)
solubility 
water: soluble100mg/mL, clear, colorless
form 
Solid
color 
White
Specific Gravity
2.564
Water Solubility 
50.8 g/100 mL (25 ºC)
Sensitive 
Hygroscopic
Merck 
14,7660
Stability:
Stable. Incompatible with strong oxidizing agents, moisture.
CAS DataBase Reference
7778-53-2(CAS DataBase Reference)
EPA Substance Registry System
Tripotassium phosphate (7778-53-2)
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Safety

Hazard Codes 
C,Xi
Risk Statements 
38-41-34
Safety Statements 
26-39-45-36/37/39
RIDADR 
UN 1805 8/PG 3
WGK Germany 
2
RTECS 
TC8450000
8-10
TSCA 
Yes
HS Code 
28352400
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N-Bromosuccinimide Price More Price(15)

Sigma-Aldrich Gold
Product number:
P5629
Product name :
Potassium phosphate tribasic
Purity:
reagent grade, ≥98%
Packaging:
1kg
Price:
$75.8
Updated:
2019/12/02
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Sigma-Aldrich Gold
Product number:
P5629
Product name :
Potassium phosphate tribasic
Purity:
reagent grade, ≥98%
Packaging:
10kg
Price:
$441
Updated:
2019/12/02
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Alfa Aesar Gold
Product number:
041587
Product name :
Potassium phosphate, anhydrous, 97%
Packaging:
1kg
Price:
$122
Updated:
2020/06/24
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Alfa Aesar Gold
Product number:
041587
Product name :
Potassium phosphate, anhydrous, 97%
Packaging:
5kg
Price:
$395
Updated:
2020/06/24
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Strem Chemicals Gold
Product number:
19-3800
Product name :
Potassium phosphate, anhydrous, min. 97%
Packaging:
1kg
Price:
$52
Updated:
2020/06/24
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Potassium phosphate Chemical Properties,Usage,Production

Description

Potassium phosphate is a reagent with high buffering capacity, It serves as a buffering agent to regulate pH, Typically used as a component for a wide variety of media used in the culture of microorganisms, as a component in phosphate buffered saline (PBS). It occurs in several forms: monobasic, dibasic, and tribasic (K3PO4). Most pH neutral potassium phosphate buffer solutions consist of mixtures of the monobasic and dibasic forms to varying degrees, depending on the desired pH. Gomori buffers, the most commonly used phosphate buffers, consist of a mixture of monobasic dihydrogen phosphate and dibasic monohydrogen phosphate. By varying the amount of each salt, a range of buffers can be prepared that buffer well between pH 5.8 and pH 8.0 (please see the tables below). Phosphates have a very high buffering capacity and are highly soluble in water.
potassium phosphate buffer recipe table
Potassium phosphate is used as a fertilizer and food additive. It is also used in optical modulators and for non-linear optics such as second-harmonic generation (SHG). It is involved in the phase-transfer catalyzed preparation of acetylenes from the corresponding vicinal dibromo compounds through double dehydrobromination. It is also useful for the oxidative coupling of thiols to disulfide.

Uses

  1. Potassium phosphate is an acidity regulator and chelating agent (used to bind metal ions). It prevents desiccation and is used as an acid stabiliser in powders as well as to prevent formation of clumps. It increases the activity of antioxidants.
  2. In the food industry (Food additives), it is used as emulsifier, potassium fortifier, flavoring agent, meat binder. Potassium phosphate helps stabilize, thicken and regulate the acidity and moisture in foods. According to the provision of the FAO(1984), its application and limited amount is as below: instant broth; total phosphate salt: 1000 mg/kg (calculated based on P2O5); cooked pork forelegs, ham, cooked minced meat 3g/kg (single usage amount or combination amount with other phosphate, calculated on P2O5); low concentrated milk powder, condensed milk, dilute cream: 2 g/kg (single usage amount); combination amount with other stabilizer: 3 (calculated on anhydrous substance); milk powder, processed cheese: 5g/kg; processed cheese, the total amount of phosphate 9g/kg (calculated as phosphorus); cold drink: 2g/kg (single usage amount or combination amount with other phosphate, calculated on P2O5).
  3. It can be used for the preparation of pasta products with alkaline water.It can be used for the manufacture of liquid soap, high-quality paper, refined gasoline, high-quality paper, being the phosphorus and potassium fertilizers. It can be used as boiler water softener. Also used in medicine.Potassium phosphate is sometimes used as a medicine. It can have a diuretic effect and act as a laxative when used in medicinal amounts. However, phosphorus can interact with some medications, including corticosteroids and potassium-sparing diuretics, increasing the risk for adverse effects; only use it when advised to do so by a doctor.
  4. It can be used as analytical reagent, buffer and softener.

Toxicity

ADI 0 to 70 (calculate based on the total phosphate as phosphorus; FAO/WHO, 2001).
ADI 0 to 70 mg/kg (calculated as phosphorus, FAO/WHO, 1985). It is generally recognized as being safe (US Food and Drug Administration, 1985). According to the provision of the FAO(1984); instant broth; total phosphate salt: 1000 mg/kg (calculated based on P2O5); cooked pork forelegs, ham, cooked minced meat 3g/kg; low concentrated milk powder, condensed milk, dilute cream: 2 g/kg; milk powder, processed cheese: 5g/kg; processed cheese, the total amount of phosphate 9g/kg (calculated as phosphorus); cold drink: 2g/kg.

Side effects

Phosphates are normal essential salts for the body. In view of the need to avoid calcium deficiency, their use is limited, as they bind up calcium readily. They have no side effects.

Chemical Properties

white powder or crystals

Physical properties

Colorless orthorhombic crystals; deliquescent; density 2.564 g/cm3at 17°C;melts at 1,380°C; very soluble in water, 90 g/100mL at 20°c; aqueous solutions strongly alkaline; insoluble in alcohol.

Uses

It is used as a buffering agent.

Preparation

The tribasic salt is produced by complete neutralization of phosphoric acid with potassium hydroxide, followed by evaporation and crystallization:H3PO4+ 3KOH →K3PO4+ 3H2O.

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7778-53-2, Potassium phosphateRelated Search:

POTASSIUM CYANIDE Potassium BUFFER SOLUTION, PH 3.0 Potassium phosphate reibasic anhydrous PHOSPHATE STANDARD Potassium hexafluorophosphate Calcium phosphate phosphate POTASSIUM PHOSPHATE, MONOBASIC,PRIMARY POTASSIUM PHOSPHATE,PRIM-POTASSIUM PHOSPHATE,POTASSIUM PHOSPHATE MONOHYDRATE,MONOBASIC POTASSIUM PHOSPHATE,POTASSIUM PHOSPHATE MONOBASIC:*ANHYDROUS MOLECULAR,POTASSIUM PHOSPHATE MONOBASIC, ANHYDROU&,POTASSIUM PHOSPHATE MONOBASIC, REAGENTPLUS TM, >= 99.0%,Dihydrogen potassium phosphate,POTASSIUM PHOSPHATE DIHYDRATE Ammonium dihydrogen phosphate FERRIC PHOSPHATE Potassium phosphate Potassium sorbate Zinc phosphate Sodium Phosphate Monobasic Monohydrate Losartan potassium POTASSIUM PHOSPHITE Potassium triphosphate
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Description Uses Toxicity Side effects