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2809-21-4

Basic Information
CAS No.: 2809-21-4
Name: 1-Hydroxyethane-1,1-diphosphonic Acid
Molecular Structure:
Molecular Structure of 2809-21-4 (1-Hydroxyethane-1,1-diphosphonic Acid)
Formula: C2H8O7P2
Molecular Weight: 206.02
Synonyms: (1-Hydroxyethylidene)bisphosphonic acid;(1-Hydroxyethylidene)diphoshonic acid;(Hydroxyethylidene)diphosphonic acid;1,1,1-Ethanetriol diphosphonate;1-Hydroxyethane-1,1-bisphosphonic acid;1-Hydroxyethane-1,1-diphosphonate;1-Hydroxyethanediphosphonic acid;1-Hydroxyethylidene-1,1-bisphosphonate;1000SL;Acetodiphosphonic acid;Acide etidronique [INN-French];Acidum etidronicum [INN-Latin];BRN 1789291;Dequest 2010;Dequest Z 010;EHDP;Ethane-1-hydroxy-1,1-diphosphonic acid;Etidronate;Ferrofos 510;Hydroxyethane-1,1-diphosphonic acid;Oxyethylidenediphosphonic acid;Phosphonic acid, (1-hydroxyethylidene)di-;RP 61;Turpinal SL;UNII-M2F465ROXU;Phosphonic acid, P,P'-(1-hydroxyethylidene)bis-;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP);HT-101 HEDP;
EINECS: 220-552-8
Density: 2.114 g/cm3
Melting Point: 198~199 °C
Boiling Point: 578.8 °C at 760 mmHg
Flash Point: 303.8 °C
Solubility: Soluble in water.
Appearance: light beige powder
Hazard Symbols: IrritantXi
Risk Codes: 37/38-41
Safety: 26-39
Transport Information: UN 3265
PSA: 154.91000
LogP: -0.99220
Downstream Products
64-19-7
7664-38-2
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Chemistry

Molecular structure of 1-Hydroxyethane-1,1-diphosphonic Acid (CAS NO.2809-21-4) is:

Product Name: 1-Hydroxyethane-1,1-diphosphonic Acid
CAS Registry Number: 2809-21-4
IUPAC Name: (1-hydroxy-1-phosphonoethyl)phosphonic acid
Molecular Weight: 206.028242 [g/mol]
Molecular Formula: C2H8O7P2
XLogP3-AA: -3.7
H-Bond Donor: 5
H-Bond Acceptor: 7 
EINECS: 220-552-8
Melting Point: 198~199 °C 
Stability: Stable. Incompatible with strong oxidizing agents.
Surface Tension: 139.2 dyne/cm
Density: 2.114 g/cm3
Flash Point: 303.8 °C
Enthalpy of Vaporization: 99.45 kJ/mol
Boiling Point: 578.8 °C at 760 mmHg
Vapour Pressure: 8.34E-16 mmHg at 25°C
Product Categories: Industrial/Fine Chemicals;Inorganic & Organic Chemicals;Analytical Chemistry;Ligands for Pharmaceutical Research;Radiopharmaceutical Chemistry (Chelating Reagents);Phosphonate antiscalant

Uses

 1-Hydroxyethane-1,1-diphosphonic Acid (CAS NO.2809-21-4) is a bisphosphonate used in detergents, water treatment, cosmetics and pharmaceutical treatment. It is a chelating agent and may be added to bind or, to some extent, counter the effects of substances, such as calcium, iron or other metal ions, which may be discharged as a component of grey wastewater and could conceivably contaminate groundwater supplies. As a phosphonate it has corrosion inhibiting properties on unnalloyed steel. It also acts to retard rancidification and oxidation of fatty acids.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 oral 1800mg/kg (1800mg/kg)   Angewandte Chemie, International Edition in English. Vol. 14, Pg. 94, 1975.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Moderately toxic by ingestion. When heated above 200° it decomposes violently to produce toxic fumes of phosphine, phosphoric acid, and POx.
Hazard Codes: IrritantXi
Risk Statements: 37/38-41 
R37/38:Irritating to respiratory system and skin. 
R41:Risk of serious damage to the eyes.
Safety Statements: 26-39 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S39:Wear eye / face protection.
RIDADR: UN 3265
WGK Germany: 2
RTECS: SZ8562100
F: 10
HazardClass: 8
PackingGroup: II

Specification

 1-Hydroxyethane-1,1-diphosphonic Acid , its cas register number is 2809-21-4. It also can be called (1-Hydroxyethylidene)bisphosphonic acid ; 1-Hydroxy-1,1-diphosphonoethane ; 1-Hydroxyethane-1,1-diphosphonic Acid [USAN:INN:BAN] ; Phosphonic acid, (1-hydroxyethylidene)bis- ; (1-Hydroxyethylene)diphosphonic acid ; (1-Hydroxyethylidene)bis(phosphonic acid) .It is a light beige powder.

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