POTASSIUM ARSENATE Chemical Properties

Melting point:

277-283 °C(lit.)

Density 

2.867

solubility 

: clear to very slightly hazy, colorless to faintly yellow

form 

powder

color 

white to off-white

Specific Gravity

2.8

Water Solubility 

g/100g solution H2O: 15.7 (0°C), 23.6 (25°C), 48.0 (100°C); solid phase, KH2AsO4 ·H2O (0°C, 25°C), KH2AsO4 (100°C) [KRU93]; slowly soluble in 1.6 parts glycerol; insoluble alcohol [MER06]

Merck 

13,7689

EPA Substance Registry System

Potassium arsenate (7784-41-0)

Safety Information

Hazard Codes 

T,N

Risk 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)

MSDS

• Language:English Provider:SigmaAldrich

POTASSIUM ARSENATE Usage And Synthesis

Chemical Properties

Potassium arsenate is a colorless to white crystalline solid.

Chemical Properties

Colorless crystals. Soluble in water; insoluble in alcohol.

Uses

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

Preparation

Monopotassium arsenate(V) is prepared by calcining a mixture of equal parts of arsenic oxide and potassium nitrate in cast-iron cylinders, leach ing the melt with water, and concentrating the solution with arsenic acid. It forms white crystal crusts.

Hazard

Toxic by ingestion and inhalation, strong irritant.

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.

POTASSIUM ARSENATE(7784-41-0)Related Product Information

• Gallium arsenide
• C. I. Pigment White 16 (77625)
• ARSENIC ACID
• POTASSIUM HEXAFLUOROARSENATE
• POTASSIUM ARSENITE
• POTASSIUM ARSENATE
• ARSENIC(V) OXIDE HYDRATE
• arsenous acid
• potassium arsenite
• POTASSIUM HYDROGENARSENATE DIHYDRATE