Nessler solution

Tetraiodomercurial (II) acid potassium
Another name Nessler solution
Identification information
CAS registration number	7783-33-7
United Nations / North America number	3287
Characteristic
Chemical formula	K2HgI4
Molar mass	786.4 g/mol
Density	1.16 g/cm3
Melting point	120-127 degrees Celsius, 266 K, -77 degrees Fahrenheit
The risk
Safe data sheet (outside link)	[1]
Associated material
Other anions	Mercury (II) iodide
I can put a case, the data without the special mention for normal temperature (25 degrees Celsius), the ordinary pressure (100 kPa).

The Nessler solution which produced brown deposition in response to ammonia

The Nessler solution (Nessler's reagent to do Nessler, and to burn) is the reagent which is used to detect a very small amount of ammonia. The CAS registration number is 7783-33-7.

I was discovered in 1856 by German agricultural techniques chemist, Julius Nessler (German version).

Table of contents

Property

• The mixture of mercury (II) water solution iodide and the potassium iodide water solution.
• I show a strong base (strong alkali) to include potassium hydroxide
• A light yellow liquid. Unscented. There is not the volatility.
• Noninflammability.
• I drop it to a sample (water solution) and when I wave it and mix it, I react when I include ammonia and produce brown deposition NHg₂I [¹].

Sensitivity

I react to a very small amount of ammonia which there is to a sample. The sensitivity is approximately 0.3 μg of NH₃ in sample 2μL.

Toxic

I include mercury and am toxic for the human body, a creature, environment.

Recent tendency

• It is a classic reagent by the former examination of water and was used for an experiment of the science again, but the Nessler solution is not used by concern to the toxicity and environmental pollution.
• As for the detection, the quantification of the ammonia (ammonium ion) of samples, a method to estimate by the detection, the quantification of a nitrite ion and the nitric acid ion to coexist indirectly is mainstream unless I demand closeness. In addition, I bring a hydrogen chloride close, and there is the method detecting the ammonia by white smoke of ammonium chloride.

Footnote

1. ^ Shuji Abe, composition and structure "of" Nessler reaction generation sediment, chemical education, 14(3), p.325 (1966). CiNii

Allied item

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