10343-62-1

Basic information

• Product Name: METAPHOSPHORIC ACID
• Synonyms: M-PHOSPHORIC ACID;PHOSPHORIC ACID, META;VITREOUS SODIUM ACID METAPHOSPHATE;METAPHOSPHORIC ACID;Metaphosphoric acid (HPO3);Phosphorus hydoxide dioxide;META-PHOSPHORIC ACID PIECES FOR ANALYSIS;Phosphenic acid
• CAS NO: 10343-62-1
• Molecular Formula: HO₃P
• Molecular Weight: 79.98
• EINECS: 253-433-4
• Mol File: 10343-62-1.mol
• Article Data: 3

Chemical Properties

• Appearance: Clear/pieces
• Water Solubility: dissolves very slowly in cold H2O to form H3PO4, formation of H3PO4 accelerated by boiling; soluble alcohol [MER06]
• CAS DataBase Reference: METAPHOSPHORIC ACID(CAS DataBase Reference)
• NIST Chemistry Reference: METAPHOSPHORIC ACID(10343-62-1)
• EPA Substance Registry System: METAPHOSPHORIC ACID(10343-62-1)

Safety Data

• Hazard Codes: C
• Statements: 34
• Safety Statements: 26-36/37/39-45
• RIDADR: UN 3260 8/PG 3
• WGK Germany: 3
• F: 3
• Hazardous Substances Data: 10343-62-1(Hazardous Substances Data)

Usage

Description

Metaphosphoric acid is a singularly anhydrous version of orthophosphoric acid and is sometimes used as a water- or moisture-absorbing reagent. Metaphosphoric acid has phosphorus in the formal oxidation state of ＋5. Although it has several CAS numbers: 10343-62-1, 135306-83-1, 13566-25-1, and 37267-86-0, only the last two are associated with the IUPAC name “phosphenic acid”. Metaphosphoric acid units can be bonded together in rings (cyclic structures), chains (catena), or branched by condensation yielding water as each acid unit is added. These structures consist of linked metaphosphoric acid molecules. For example, trimetaphosphoric acid is the simplest cyclophosphoric acid. Metaphosphoric acid would need to share the doubly bonded oxygen with neighboring phosphorus atoms to form polymers itself. Many oligamers are possible with the alkaline earths but the trimetaphosphates and hexametaphosphates seem to be the most prevalent.

Chemical Properties

transparent, glass-like solid or soft silky masses; hygroscopic; volatilizes at red heat (HPO3)n [MER06]

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)

Upstream product

• 4861-19-2 urea phosphate 
• 15389-19-2 metaphosphate 
• 7664-93-9 sulfuric acid 
• 7789-21-1 fluorosulphonic acid 
• 509-14-8 tetranitromethane 
• 87965-36-4 HO₃P^(1-) 

Downstream Products

• 10361-03-2 sodium hypophosphate 
• 32819-55-9 hydrogen [75Se]selenide 

Related news

Vitamin C in plasma: A comparative study of the vitamin stabilized with trichloroacetic acid or METAPHOSPHORIC ACID (cas 10343-62-1) and the effects of storage at − 70°, − 20°, 4°, and 25° on the stabilized vitamin08/01/2019

Vitamin C concentration in human plasma was shown to be affected by storage time and temperature as well as by the kind of stabilizer used. Samples were stored for periods of time up to 21 days at temperatures of 25°, 4°, − 20°, and − 70°. Stabilizers employed in this study included trichlor...detailed

Modifying cellulose with METAPHOSPHORIC ACID (cas 10343-62-1) and its efficiency in removing brilliant green dye07/28/2019

In this study, cellulose was chemically modified through the addition of the phosphorylating agent, metaphosphoric acid in order to obtain a new material (MPCel) with higher adsorptive properties than the starting material. Both materials were characterized by infrared spectroscopy, X-ray diffra...detailed

Relevant articles and documents

Phosphite Radicals and Their Reactions. Examples of Redox, Substitution, and Addition Reactions

Phosphite radicals HPO3(-) and PO3(2-), which exist in an acid-base equilibrium with pK = 5.75, are shown to take part in various types of reactions.In the absence of scavengers, they disappear mainly by second-order disproportionation and combination; a first-order contribution to the decay is also indicated.HPO3(-) and PO3(2-) are good reductants toward electron acceptors such as tetranitromethane.In this reactions phosphate and C(NO2)3(-) are formed.Phosphite radicals can, however, also act as good oxidants, e.g., toward thiols and thiolate ions.These reactions lead to the formation of RS. radicals which were identified either directly, as in the case of penicillamine, through the optical absorption of PenS. or more indirectly through equilibration of RS. with RS(-) to the optically absorbing RSSR.(-) disulfide radical anion.A homolytic substitution reaction (SH2) occurs in the reaction of the phosphite radicals with aliphatic disulfides, yielding RS. radicals and phosphate thioester RSPO3(2-).Lipoic acid, as an example of a cyclic disulfide, is reduced to the corresponding RSSR.(-) radical anion and also undergoes the SH2 reaction with about equal probability.An addition reaction is observed between phosphite radicals and molecular oxygen.The resulting peroxo phosphate radicals establish an acid-base equilibrium HPO5(-). PO5(2-). + H(+) with a pK = 3.4.Absolute rate constants were determined for all reactions discussed.

Polymerization catalyst and deodorizing agent and process of use

Calcium silicate treated with an acid can be used as a polymerization catalyst or as a deodorizing agent. The acid is sulfuric acid, phosphoric acid or nitric acid.