Mercurous Nitrate

Updated: 2026-08-06

Overview

Mercury(I) nitrate is a mercury-containing inorganic compound that has been known since the early 19th century. As one of the few stable mercury(I) compounds, it is notable for containing the unusual Hg2²⁺ ion where two mercury atoms form a covalent bond. Its historical use in medicine has been entirely discontinued due to mercury toxicity concerns. In modern industrial and laboratory contexts, this compound serves primarily as a specialty reagent for mercury compound synthesis and analytical procedures. Its use is strictly regulated worldwide due to environmental and health concerns associated with mercury compounds.

Physical and Chemical Properties

Mercury(I) nitrate appears as white crystals that gradually decompose upon exposure to light or moisture. Unlike mercury(II) nitrate, it contains mercury in the +1 oxidation state. The compound is sparingly soluble in water and decomposes to form mercury(II) oxide and nitric acid when dissolved. Key chemical behaviors include its oxidation to mercury(II) compounds when heated or exposed to strong oxidizers. It reacts with halides to form insoluble mercury(I) halides. The solid compound should always be stored with desiccants as it readily absorbs moisture from air, accelerating decomposition.

Main Applications

In contemporary use, mercury(I) nitrate finds limited but important applications in analytical chemistry, particularly in qualitative inorganic analysis for halide detection. It serves as a precursor in the synthesis of other mercury(I) compounds where the Hg2²⁺ ion is required. Historically significant but now obsolete applications included its use in felt production (leading to 'mad hatter' mercury poisoning) and as an antiseptic. Modern industrial applications are highly specialized and typically conducted under controlled conditions with strict mercury emission controls.

Safety and Storage

As with all mercury compounds, mercury(I) nitrate requires stringent safety measures. It is classified as acutely toxic, hazardous to aquatic life, and corrosive. Proper handling mandates fume hood use, impermeable gloves, and eye protection to prevent contact with skin or mucous membranes. Storage requires airtight containers with desiccants, kept in cool (but not freezing) conditions away from light. Incompatible materials include reducing agents, organic compounds, and metals. Spills must be contained using specialized mercury spill kits, not conventional absorbents.

B2B Procurement Guide

Industrial buyers should prioritize suppliers who provide comprehensive mercury tracking documentation and proper hazardous material packaging. Given regulatory constraints, verify the supplier's ability to provide internationally compliant safety data sheets and transportation documentation. Purchasers should confirm analytical certificates for purity (typically 98-99.9%) and mercury content. Consider ordering smaller quantities despite potential bulk discounts due to storage challenges and regulatory reporting thresholds for mercury compounds in many jurisdictions.