Nessler's (King) reagent

Name: Nessler's (King) reagent
Brand: Vaqora Chemicals
SKU: VQ-003608

About Nessler's (King) reagent

Vaqora Chemicals supplies Nessler's (King) reagent, a diagnostic reagent registered under CAS number 7783-33-7. Its molecular formula is HgI4K2 and its molecular weight is 786.41 g/mol. The IUPAC name is dipotassium. Tetraiodomercury(2-). Common synonyms include Nessler's reagent and Potassium mercuric iodide.

The material typically appears as a pale yellow liquid. Store in a cool, well-ventilated place, away from sources of ignition, with the container tightly sealed. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

It is commonly used for clinical chemistry, diagnostic assays and pathology laboratories. Typical end-use sectors are academic and industrial research and diagnostics and biotechnology.

Standard pack sizes are 100 mL, 500 mL and 25 L, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Clinical chemistry
Diagnostic assays
Pathology laboratories

Industries

Specifications & identifiers

Chemical identifiers
Product name	Nessler's (King) reagent
Catalogue No.	VQ-003608
CAS Number	7783-33-7
IUPAC name	dipotassium;tetraiodomercury(2-)
Molecular formula	HgI₄K₂
Molecular weight	786.41 g/mol
Exact mass	787.5159
HSN code	38229090
InChIKey	OPCMAZHMYZRPID-UHFFFAOYSA-J
SMILES	[K+].[K+].I[Hg-2](I)(I)I
PubChem CID	24542

Physical properties
Physical form	Liquid
Appearance	Pale yellow liquid
H-bond donors / acceptors	0 / 1
TPSA	0 Å²
UN number	UN 2922
Synonyms	Potassium tetraiodomercurate – Potassium hydroxide solution, Nessler's reagent, Potassium mercuric iodide, Dipotassium tetraiodomercurate, Mayer's reagent, Potassium tetraiodomercurate(II), Nessler reagent, Potassium iodomercurate, Mercury potassium iodide, Mercury(II) potassium iodide, Potassium mercuriiodide, Potassium mercury iodine

Safety & hazard information (GHS)

Toxic

Health hazard

Environmental hazard

Signal word: Danger

Hazard statements

H300Fatal if swallowed
H310Fatal in contact with skin
H330Fatal if inhaled
H373May causes damage to organs through prolonged or repeated exposure
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P260, P262, P264, P270, P271, P273, P280, P284, P301 + P316, P302 + P352, P304 + P340, P316, P319, P320, P321, P330, P361 + P364, 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

Other grades of CAS 7783-33-7

Nesslers reagent

CAS: 7783-33-7
Formula: HgI₄K₂
MW: 786.41 g/mol

VQ-003609

Potassium mercuric iodide

CAS: 7783-33-7
Formula: HgI₄K₂
MW: 786.41 g/mol

VQ-014047

Potassium mercuric iodide, solution

CAS: 7783-33-7
Formula: HgI₄K₂
MW: 786.41 g/mol

VQ-003632

Frequently asked questions

What is the CAS number of Nessler's (King) reagent?

The CAS Registry Number of Nessler's (King) reagent is 7783-33-7. It is also known as Potassium tetraiodomercurate – Potassium hydroxide solution, Nessler's reagent, Potassium mercuric iodide.

What is the molecular formula and molecular weight of Nessler's (King) reagent?

Nessler's (King) reagent has the molecular formula HgI4K2 and a molecular weight of 786.41 g/mol.

Which grade and pack sizes of Nessler's (King) reagent can I order?

We supply Nessler's (King) reagent, in 100 mL, 500 mL, 25 L packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Nessler's (King) reagent?

Yes. Every lot of Nessler's (King) reagent 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 Nessler's (King) reagent be shipped internationally?

Yes. Nessler's (King) reagent is classified as hazardous (UN 2922), 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.