Potassium arsenate

About Potassium arsenate

Potassium arsenate is an alkali metal compound carrying the CAS registry number 7784-41-0. Formula AsH2KO4, molecular weight 180.03 g/mol. The IUPAC name is potassium dihydrogen arsorate. Common synonyms include Arsenic acid potassium salt and Potassium dihydrogen arsenate.

The product is provided as a solid. Store in a tightly closed container in a cool, dry and well-ventilated place. It carries the GHS signal word “Danger” with 5 hazard statements. Review the Safety Data Sheet before use.

It is commonly used for materials research and chemical synthesis. It is used across academic and industrial research.

Standard pack sizes are 25 g, 100 g and 500 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Materials research
Chemical synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Potassium arsenate
Catalogue No.	VQ-013986
CAS Number	7784-41-0
IUPAC name	potassium dihydrogen arsorate
Molecular formula	AsH₂KO₄
Molecular weight	180.03 g/mol
Exact mass	179.8806
HSN code	28429010
InChIKey	GVPLVOGUVQAPNJ-UHFFFAOYSA-M
SMILES	O[As](=O)(O)[O-].[K+]
PubChem CID	516881

Physical properties
Physical form	Solid
Appearance	Solid
H-bond donors / acceptors	2 / 4
TPSA	80.6 Å²
UN number	UN 1677
Synonyms	Arsenic acid potassium salt, Potassium dihydrogen arsenate, Macquer's salt, Monopotassium arsenate, Potassium acid arsenate, Potassium hydrogen arsenate, Potassium dihydrogenarsenate, Potassium arsenate, monobasic, Arsenic acid, monopotassium salt, Monopotassium dihydrogen arsenate, Potassium hydrogen arsenate (KH2AsO4), Potassium dihydrogen arsenate (KH2AsO4)

Safety & hazard information (GHS)

Toxic

Health hazard

Environmental hazard

Signal word: Danger

Hazard statements

H301Toxic if swallowed
H331Toxic if inhaled
H350May cause cancer
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P203, P261, P264, P270, P271, P273, P280, P301 + P316, P304 + P340, P316, P318, P321, P330, P391, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Potassium arsenate?

The CAS Registry Number of Potassium arsenate is 7784-41-0. It is also known as Arsenic acid potassium salt, Potassium dihydrogen arsenate, Macquer's salt.

What is the molecular formula and molecular weight of Potassium arsenate?

Potassium arsenate has the molecular formula AsH2KO4 and a molecular weight of 180.03 g/mol. Its IUPAC name is potassium dihydrogen arsorate.

Which grade and pack sizes of Potassium arsenate can I order?

We supply Potassium arsenate, in 25 g, 100 g, 500 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Potassium arsenate?

Yes. Every lot of Potassium arsenate is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Potassium arsenate be shipped internationally?

Yes. Potassium arsenate is classified as hazardous (UN 1677), so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.