Mercuric Potassium Iodide

Nessler’s Reagent

CAS #:

Linear Formula:


MDL Number:


EC No.:



(2N) 99% Mercuric Potassium Iodide
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(3N) 99.9% Mercuric Potassium Iodide
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(4N) 99.99% Mercuric Potassium Iodide
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(5N) 99.999% Mercuric Potassium Iodide
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Mercuric Potassium Iodide Properties (Theoretical)

Compound Formula K2HgI4
Molecular Weight 786.4
Appearance Yellow crystals or liquid
Melting Point N/A
Boiling Point N/A
Density 1.16 g/cm3
Solubility in H2O N/A
Exact Mass 787.515948
Monoisotopic Mass 787.515948

Mercuric Potassium Iodide Health & Safety Information

Signal Word Danger
Hazard Statements H300 +H310 + H330-H314-H373-H410
Hazard Codes C, T+,N
Precautionary Statements P261-P273-P280-P301 + P310 + P330-P303 + P361 + P353-P305 + P351 + P338
Risk Codes 26/27/28-33-35-50/53
Safety Statements 26-28-36/37/39-45-61
RTECS Number N/A
Transport Information UN 2922 8/PG 2
WGK Germany 3

About Mercuric Potassium Iodide

Mercuric Potassium Iodide is generally immediately available in most volumes. High purity, submicron and nanopowder forms may be considered. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.

Mercuric Potassium Iodide Synonyms

Mercury Potassium Iodide; Mercury(II) Potassium Iodide; Potassium Mercuric Iodide; potassium tetraiodomercurate; Mayer's reagent, Channing's solution, Potassium iodomercurate; Nessler's reagent; Nessler reagent;; Potassium tetraiodomercurate(II); Dipotassium tetraiodomercury

Chemical Identifiers

Linear Formula K2HgI4
MDL Number MFCD00049656
EC No. 231-990-4
Pubchem CID 24542
IUPAC Name dipotassium; tetraiodomercury(2-)
SMILES [K+].[K+].I[Hg-2](I)(I)I
InchI Identifier InChI=1S/Hg.4HI.2K/h;4*1H;;/q+2;;;;;2*+1/p-4

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Iodine products. Iodine (atomic symbol: I, atomic number: 53) is a Block P, Group 17, Period 5 element with an atomic radius of 126.90447. The number of electrons in each of Iodine's shells is 2, 8, 18, 18, 7 and its electron configuration is [Kr] 4d10 5s2 5p5. The iodine atom has a radius of 140 pm and a Van der Waals radius of 198 pm. In its elemental form, iodine has a lustrous metallic gray appearance as a solid and a violet appearance as a gas or liquid solution. Elemental IodineIodine forms compounds with many elements, but is less active than the other halogens. It dissolves readily in chloroform, carbon tetrachloride, or carbon disulfide. Iodine compounds are important in organic chemistry and very useful in the field of medicine. Iodine was discovered and first isolated by Bernard Courtois in 1811. The name Iodine is derived from the Greek word "iodes" meaning violet.


Mercury Bohr ModelSee more Mercury products. Mercury (atomic symbol: Hg, atomic number: 80) is a Block D, Group 12, Period 6 element with an atomic weight of 200.59. The number of electrons in each of mercury's shells is 2, 8, 18,32, 18, 2 and its electron configuration is [Xe] 4f14 5d10 6s2. The mercury atom has a radius of 151 pm and a Van der Waals radius of 209 pm. It is named after the planet Mercury and often referred to as "quicksilver" due to its appearance as a silvery liquid. Mercury has low melting and boiling points. It is a poor conductor of heat, but a fair conductor of electricity. Mercury is found both as a free element and in cinnabar, corderoite, and livingstonite ores.


Elemental PotassiumSee more Potassium products. Potassium (atomic symbol: K, atomic number: 19) is a Block S, Group 1, Period 4 element with an atomic weight of 39.0983. The number of electrons in each of Potassium's shells is [2, 8, 8, 1] and its electron configuration is [Ar] 4s1. The potassium atom has a radius of 227.2 pm and a Van der Waals radius of 275 pm. Potassium was discovered and first isolated by Sir Humphrey Davy in 1807. Potassium is the seventh most abundant element on earth. It is one of the most reactive and electropositive of all metals and rapidly oxidizes. As with other alkali metals, potassium decomposes in water with the evolution of hydrogen because of its reacts violently with water, it only occurs in nature in ionic salts.Potassium Bohr Model In its elemental form, potassium has a silvery gray metallic appearance, but its compounds (such as potassium hydroxide) are more frequently used in industrial and chemical applications. The origin of the element's name comes from the English word 'potash,' meaning pot ashes, and the Arabic word qali, which means alkali. The symbol K originates from the Latin word kalium.


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