37267-86-0

Basic information

• Product Name: Metaphosphoric acid
• Synonyms: METAPHOSPHORIC ACID, CHIP, REAGENTPLUS, 99.99%;META-PHOSPHORIC ACID ~65%, PIECES;METAPHOSPHORIC ACID, ACS REAGENT;METAPHOSPHORIC ACID, EXTRA PURE ( SOLID);Meta-PhosphoricAcidGr(GlacialSticks);M-PhosphoricAcidGr;Metaphosphoricacid,ACS;Metaphosphoric acid, stabilized
• CAS NO: 37267-86-0
• Molecular Formula: HO3P
• Molecular Weight: 79.98
• EINECS: 253-433-4
• Product Categories: UVCBs-inorganic
• Mol File: 37267-86-0.mol
• Article Data: 0

Chemical Properties

• Melting Point: 21°C
• Boiling Point: 158°C
• Appearance: Glassy/pieces
• Density: 2,2 g/cm3
• Vapor Pressure: 0.04 hPa at 20 °C
• Storage Temp.: Store below +30°C.
• Solubility: Soluble in alcohol.
• Water Solubility: Decomposes in water. Soluble in alcohol.
• Sensitive: Hygroscopic
• Stability: Stable. Incompatible with strong bases, most metals.
• Merck: 14,7345
• CAS DataBase Reference: Metaphosphoric acid(CAS DataBase Reference)
• NIST Chemistry Reference: Metaphosphoric acid(37267-86-0)
• EPA Substance Registry System: Metaphosphoric acid(37267-86-0)

Safety Data

• Hazard Codes: C
• Statements: 34-35-22-37
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 3260 8/PG 3
• WGK Germany: 3
• F: 3
• TSCA: Yes
• HazardClass: 8
• PackingGroup: III
• Hazardous Substances Data: 37267-86-0(Hazardous Substances Data)

Usage

Description

Metaphosphoric acid, also known as pyrophosphoric acid, is a monobasic inorganic acid with the chemical formula H2P2O7. It is a glass-like colorless solid that is soft, transparent, and deliquescent. Metaphosphoric acid sublimes at red heat and dissolves slowly in cold water, decomposing to phosphoric acid. It is also soluble in alcohol.

Uses

Used in Research:
Metaphosphoric acid is used as an inorganic reagent for research purposes, contributing to the advancement of scientific knowledge and understanding of various chemical processes.
Used in Dentistry:
In the field of dentistry, metaphosphoric acid is utilized in the production of zinc oxyphosphate cement. This application takes advantage of its properties to create a strong and durable cement for dental restorations.
Used in Chemical Analysis:
As a reagent in chemical analysis, metaphosphoric acid plays a crucial role in various analytical techniques, helping to identify and quantify different substances in a sample.
Used as a Dehydrating Agent:
Metaphosphoric acid is employed as a dehydrating agent due to its ability to remove water from a system. This property makes it useful in various industrial processes where the removal of water is necessary.
Used as a Phosphorylating Agent:
In some applications, metaphosphoric acid serves as a phosphorylating agent, facilitating the transfer of a phosphate group to another molecule.
Used in Dental Cements:
Metaphosphoric acid is also used in the formulation of dental cements, where it contributes to the cement's properties, such as strength and durability.
Used as an Analytical Reagent:
In the field of analytical chemistry, metaphosphoric acid is used as an analytical reagent to assist in the identification and quantification of various substances.
Used in the Food Industry:
The derivative of metaphosphoric acid, sodium hexametaphosphate, is used as a sequestrant and a food additive. It helps to improve the quality, taste, and shelf life of various food products by preventing the growth of microorganisms and improving the texture.

Preparation

Metaphosphoric acid is obtained as a polymeric glassy solid by prolonged heating of phosphoric acid. Either phosphoric acid, H3PO4, or pyrophosphoric acid, H4P2O7, when heated above 300°C, on cooling yields the transparent glassy mass of composition (HPO3)n. Metaphosphoric acid also is obtained from partial hydration of phosphorus pentoxide by dissolving it in cold water.

InChI:InChI=1/C8H16O4.H3O4P/c1-5-9-6(2)11-8(4)12-7(3)10-5;1-5(2,3)4/h5-8H,1-4H3;(H3,1,2,3,4)