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Mohr's salt ; Ammonium iron(II) sulfate ; ammonium ferrous sulfate ; ammonium ferrous alum

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Description

MOHR'S SALT

Ammonium iron(II) sulfate


Summary formula: (NH4)2Fe(SO4)2 x 6H2O
EC number: 233-151-8
Appearance: light green, crystalline powder
Molar Mass: 392.14 g/mol
CAS Number: 7783-85-9

Mohr's salt, also known as ammonium iron(II) sulfate, is a chemical compound that appears as a pale green, crystalline salt. It is a double salt, formed by the combination of ammonium sulfate and iron(II) sulfate. The compound is commonly used as a reducing agent in laboratory applications, as well as in various industrial processes.

This salt is often used in volumetric analysis, particularly in redox titrations, where it acts as a standard solution in the determination of oxidizing agents. Due to its stability and less tendency to oxidize compared to other iron(II) salts, Mohr's salt is preferred in certain titrations, such as when determining the concentration of permanganate in a solution.

Mohr's salt is also employed in the preparation of iron-based pigments, in wastewater treatment, and in the synthesis of other iron compounds. It is highly soluble in water and generally stable under normal conditions. However, it should be stored in a tightly sealed container to avoid oxidation in humid environments.

As a source of iron, Mohr's salt can be harmful if ingested in large quantities or if it comes into contact with the eyes or skin. Proper handling and personal protective equipment (PPE) should be used when working with this compound.

SAFETY

Signal word Warning

Hazard statement(s) H315 Causes skin irritation. H319 Causes serious eye irritation. H335 May cause respiratory irritation. Sigma-Aldrich - 215406 Page 2 of 7

Precautionary statement(s) P261 Avoid breathing dust. P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Supplemental Hazard Statements none

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