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Potassium Phosphate Monobasic

Potassium Phosphate Monobasic Structure
CAS No.
7778-77-0
Chemical Name:
Potassium Phosphate Monobasic
Synonyms
POTASSIUM DIHYDROGEN PHOSPHATE;MONOPOTASSIUM PHOSPHATE;MKP;MONOBASIC POTASSIUM PHOSPHATE;POTASSIUM PHOSPHATE MONOHYDRATE;POTASSIUM DIHYDROGEN ORTHOPHOSPHATE;POTASSIUM PHOSPHATE, MONOBASIC;kdp;POTASSIUM ORTHOPHOSPHATE;Potassium dihydrogen phosphate anhydrous
CBNumber:
CB6122627
Molecular Formula:
H2KO4P
Molecular Weight:
136.085541
MOL File:
7778-77-0.mol
MSDS File:
SDS
Modify Date:
2024/7/1 14:39:02

Potassium Phosphate Monobasic Properties

Melting point 252.6 °C (lit.)
Boiling point > 450 °C
Density 2.338 g/mL at 25 °C (lit.)
vapor pressure 0Pa at 25℃
storage temp. Store at +5°C to +30°C.
solubility H2O: 1.5 M at 20 °C, clear, colorless
form powder
Specific Gravity 2.338
color White transparent
PH 4.2-4.6 (20g/l, H2O, 20℃)
pka (1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)
Odor Odorless
Water Solubility 222 g/L (20 ºC)
Sensitive Hygroscopic
Decomposition 253 °C
λmax λ: 260 nm Amax: 0.046
λ: 280 nm Amax: 0.040
Merck 14,7659
Stability Hygroscopic
InChIKey GNSKLFRGEWLPPA-UHFFFAOYSA-M
CAS DataBase Reference 7778-77-0(CAS DataBase Reference)
EPA Substance Registry System Monopotassium phosphate (7778-77-0)

SAFETY

Risk and Safety Statements

Symbol(GHS) 
GHS07
Signal word  Warning
Hazard statements  H313-H315-H319
Precautionary statements  P264-P280a-P305+P351+P338-P321-P332+P313-P337+P313
Hazard Codes 
HS Code  2835240000
Toxicity LD50 skin in rabbit: > 4640mg/kg
NFPA 704
0
1 0

Potassium Phosphate Monobasic price More Price(92)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich(India) SRP5099 WNK1 (181-507), active, GST tagged human PRECISIO? Kinase, recombinant, expressed in baculovirus infected Sf9 cells, ≥70% (SDS-PAGE), buffered aqueous glycerol solution 7778-77-0 10μG ₹50149.8 2022-06-14 Buy
Sigma-Aldrich(India) SAB2900175 Anti-PRKWNK1 (AB2) antibody produced in rabbit affinity isolated antibody, buffered aqueous solution 7778-77-0 50μG ₹70007.7 2022-06-14 Buy
Sigma-Aldrich(India) RDD020 Potassium phosphate monobasic anhydrous, free-flowing, Redi-Dri?, ReagentPlus?, ≥99.0% (titration) 7778-77-0 500G ₹10543.55 2022-06-14 Buy
Sigma-Aldrich(India) RDD020 Potassium phosphate monobasic anhydrous, free-flowing, Redi-Dri?, ReagentPlus?, ≥99.0% (titration) 7778-77-0 1KG ₹13650.33 2022-06-14 Buy
Sigma-Aldrich(India) SAB2900174 Anti-PRKWNK1 (AB1) antibody produced in rabbit affinity isolated antibody, buffered aqueous solution 7778-77-0 50μG ₹70007.7 2022-06-14 Buy
Product number Packaging Price Buy
SRP5099 10μG ₹50149.8 Buy
SAB2900175 50μG ₹70007.7 Buy
RDD020 500G ₹10543.55 Buy
RDD020 1KG ₹13650.33 Buy
SAB2900174 50μG ₹70007.7 Buy

Potassium Phosphate Monobasic Chemical Properties,Uses,Production

Chemical Properties

White powder

Physical properties

Colorless crystals or white granular powder; tetragonal structure; deliquesces; density 2.338 g/cm3; melts at 252.6°C; soluble in water 33 g/100mL at 25°C; pH 4.4-4.7; insoluble in alcohol.

Uses

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.

Preparation

Monopotassium phosphate may be prepared by partial neutralization of phosphoric acid with potassium hydroxide in equimolar amounts:H3PO4+ KOH →KH2PO4+ H2O.

General Description

Monobasic potassium phosphate crystals are colorless, soluble in water and hygroscopic in nature.Upon heating through 187°C, phase transition occurs in KH2PO4, crystal system changes from tetragonal to monoclinic, lattice parameters at 195°C are α=7.47?, b =7.33?, c =14.49?, α=?=90° and γ=92.2.

Solubility in organics

Insoluble to slightly soluble in ethanol, insoluble in alcohol.

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.

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