7784-41-0

Basic information

• Product Name: POTASSIUM ARSENATE
• Synonyms: ARSENIC ACID POTASSIUM SALT;POTASSIUM DIHYDROGEN ARSENATE;POTASSIUM ARSENATE;POTASSIUM ARSENATE MONOBASIC;arsenic acid potassium;monopotassium arsenate;Potassium arsenate monobasic anhydrous;POTASSIUM DIHYDROGENARSENATE, 99.9+%
• CAS NO: 7784-41-0
• Molecular Formula: AsH₂O₄*K
• Molecular Weight: 180.03
• EINECS: 232-065-8
• Mol File: 7784-41-0.mol
• Article Data: 3

Chemical Properties

• Melting Point: 277-283 °C(lit.)
• Appearance: white to off-white/powder
• Density: 2.867
• Solubility: : clear to very slightly hazy, colorless to faintly yellow
• Water Solubility: slightly
• Merck: 13,7689
• CAS DataBase Reference: POTASSIUM ARSENATE(CAS DataBase Reference)
• NIST Chemistry Reference: POTASSIUM ARSENATE(7784-41-0)
• EPA Substance Registry System: POTASSIUM ARSENATE(7784-41-0)

Safety Data

• Hazard Codes: T,N
• Statements: 45-23/25-50/53
• Safety Statements: 53-45-60-61
• RIDADR: UN 1677 6.1/PG 2
• WGK Germany: 3
• RTECS: CG1100000
• HazardClass: 6.1(a)
• PackingGroup: II
• Hazardous Substances Data: 7784-41-0(Hazardous Substances Data)

Usage

Chemical Properties

Different sources of media describe the Chemical Properties of 7784-41-0 differently. You can refer to the following data:
1. Colorless crystals. Soluble in water; insoluble in alcohol.
2. Potassium arsenate is a colorless to white crystalline solid.

Uses

In the textile, tanning, and paper industries. In insecticidal formulations (especially fly paper).

Safety Profile

Confirmed human carcinogen. Mutation data reported. When heated to decomposition it emits toxic fumes of arsenic. See also ARSENIC COMPOUNDS.

Potential Exposure

Potassium arsenate is used in the textile, tanning, preserving hides; in the textile printing and paper industries; and as an insecticide in fly baits, especially for fly paper; as laboratory reagent.

Shipping

UN1677 Potassium arsenate, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.

Incompatibilities

A weak base. Reacts with strong oxidizers, bromine azide, acids and decomposes on contact with strong acids producing acetic acid fumes. Arsine, a very deadly gas, can be released in the presence of acid, acid mists, or hydrogen gas.

InChI:InChI=1/AsH3O4.3K/c2-1(3,4)5;;;/h(H3,2,3,4,5);;;/q;3*+1/p-3

Upstream product

• 7732-18-5 water 
• 584-08-7 potassium carbonate 
• 7778-39-4 orthoarsenic acid 
• 7758-05-6 potassium iodate 
• 7440-38-2 arsenic 

Downstream Products

• 7778-39-4 orthoarsenic acid 
• 7646-93-7 potassium hydrogensulfate 

Relevant articles and documents

Vibrational study by inelastic neutron scattering, infrared absorption and Raman scattering of potassium, rubidium and cesium dihydrogenarsenate crystals: Comparison with thallium dihydrogenarsenate

The vibrational study of polycrystalline potassium, rubidium and cesium dihydrogenarsenates, KH2AsO4, RbH2AsO4 and CsH2AsO4, has been undertaken in the 20-4000 cm-1 range. The inelastic neutron scattering spectra obtained at 20 K allow a precise assignment of the OH vibrations. The infrared absorption and Raman scattering spectra of the paraelectric and ferroelectric phases have been analyzed. The three compounds are isomorphous with KH2PO4. The results are compared to those obtained for the thallium dihydrogenarsenate T1H2AsO4. In all compounds the proton dynamics appear weakly coupled to heavy atoms motions. The order-disorder transition at Tc is associated to relaxational motions of anions and protons in the tetragonal potassium, rubidium and cesium dihydrogenarsenates and to collective reorientational motions of anions in monoclinic thallium derivative. The spectroscopic features show the participation of cations K+, Rb+ and Cs+ to the dynamics of the three-dimensional lattice in both phases. In contrast, heavy-cation T1+ motions are decoupled from the dynamics of hydrogen bond layers. No correlation between ordering of lattice and OH stretching wavenumber is observed.

X-ray structural study of ferroelectric KH2AsO4 and KD2AsO4

In order to understand systematically the relationship between the crystal structure and phase transition in tetragonal KH2PO4 (KDP) family, the structures of KE2AsO4 (KDA) and KD2AsO4 (DKD