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HomeProduct name listNessler's Reagent

Nessler's Reagent

Synonym(s):Potassium tetraiodomercurate – Potassium hydroxide solution

  • CAS NO.:7783-33-7
  • Empirical Formula: HgI4K2
  • Molecular Weight: 786.4
  • MDL number: MFCD00049656
  • EINECS: 231-990-4
  • SAFETY DATA SHEET (SDS)
  • Update Date: 2024-06-03 15:07:56
Nessler's Reagent Structural

What is Nessler's Reagent?

Chemical properties

light yellow liquid

The Uses of Nessler's Reagent

Detecting the presence of ammonia, particularly in very small amounts.

The Uses of Nessler's Reagent

Mercury(II) potassium iodide is used as a pharmaceutical intermediate. It is also used as reagents, chemical research and organic intermediates.

Definition

Nessler's Reagent is a periodometallate salt that is solution of mercuric iodide in potassium iodide. It contains a tetraiodomercurate(2-).

Preparation

It is prepared by mixing 2g potassium iodide in 5ml water. To this solution, 3g of mercury (II) iodide is added, and the resulting solution is made to 20ml. Finally, 40g potassium hydroxide (30 %) is added to provide the alkaline base.

General Description

Mercuric potassium iodide, [solid] appears as odorless yellow crystals. Crystallizes with either one, two or three molecules of water. Soluble in water and denser than water. Commercially available in the anhydrous form. Highly toxic by ingestion, inhalation, and skin absorption.

Air & Water Reactions

Deliquescent. Very water soluble.

Reactivity Profile

MERCURIC POTASSIUM IODIDE is incompatible with acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper . NESSLER'S REAGENT behave in aqueous solution as a weak acid.

Hazard

Highly toxic by ingestion, inhalation, and skin absorption.

Health Hazard

Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.

Safety Profile

A poison. Moderately toxic by skin contact and intraperitoneal routes. When heated to decomposition it emits very toxic fumes of Hg, K2O, and I-. See also MERCURY.

Properties of Nessler's Reagent

Melting point: 120-127 °C(lit.)
Boiling point: 105°C
Density  1.16 g/mL at 20 °C
Flash point: >230 °F
solubility  very soluble in H2O; soluble in ethanol,ethyl ether, acetone
form  Liquid
color  Yellow to orange
Specific Gravity 1.097
Odor Odorless
Water Solubility  Soluble in water.
Sensitive  Hygroscopic
Merck  13,7773
Exposure limits ACGIH: TWA 0.025 mg/m3 (Skin)
NIOSH: IDLH 10 mg/m3; TWA 0.05 mg/m3; Ceiling 0.1 mg/m3
Stability: Stable, but light sensitive. Incompatible with strong oxidizing agents.
EPA Substance Registry System Potassium mercuric iodide (7783-33-7)

Safety information for Nessler's Reagent

Signal word Danger
Pictogram(s)
ghs
Corrosion
Corrosives
GHS05
ghs
Skull and Crossbones
Acute Toxicity
GHS06
ghs
Health Hazard
GHS08
ghs
Environment
GHS09
GHS Hazard Statements H290:Corrosive to Metals
H310:Acute toxicity,dermal
H314:Skin corrosion/irritation
H373:Specific target organ toxicity, repeated exposure
H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes P273:Avoid release to the environment.
P280:Wear protective gloves/protective clothing/eye protection/face protection.
P314:Get medical advice/attention if you feel unwell.
P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Computed Descriptors for Nessler's Reagent

InChIKey OPCMAZHMYZRPID-UHFFFAOYSA-J

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