Mercury(I) nitrate is a

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemis ...

, a salt of mercury and nitric acid with the formula Hg₂(NO₃)₂. A yellow solid, the compound is used as a precursor to other complexes of Hg₂²⁺ complexes.The structure of the hydrate has been determined by

X-ray crystallography X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles ...

. It consists of a ₂O-Hg-Hg-OH₂sup>2+ center, with a Hg-Hg distance of 254 pm.

Reactions

Mercury(I) nitrate is formed when elemental mercury is combined with ''dilute''

nitric acid Nitric acid is the inorganic compound with the formula . It is a highly corrosive mineral acid. The compound is colorless, but older samples tend to be yellow cast due to decomposition into oxides of nitrogen. Most commercially available ni ...

(concentrated nitric acid will yield mercury(II) nitrate). Mercury(I) nitrate is a

reducing agent In chemistry, a reducing agent (also known as a reductant, reducer, or electron donor) is a chemical species that "donates" an electron to an (called the , , , or ). Examples of substances that are commonly reducing agents include the Earth met ...

which is

oxidized Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a ...

upon contact with air. Mercuric nitrate reacts with elemental mercury to form mercurous nitrate. Solutions of mercury(I) nitrate are

acid In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a se ...

ic due to slow reaction with water: :Hg₂(NO₃)₂ + H₂O ⇌ Hg₂(NO₃)(OH) + HNO₃ Hg₂(NO₃)(OH) forms a yellow

precipitate In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called the precipitate. In case of an inorganic chemical reaction leading ...

. If the solution is boiled or exposed to light, mercury(I) nitrate undergoes a

disproportionation In chemistry, disproportionation, sometimes called dismutation, is a redox reaction in which one compound of intermediate oxidation state converts to two compounds, one of higher and one of lower oxidation states. More generally, the term can ...

reaction yielding elemental mercury and mercury(II) nitrate: :Hg₂(NO₃)₂ ⇌ Hg + Hg(NO₃)₂ These reactions are reversible; the nitric acid formed can redissolve the basic salt.

References

Mercury(I) compounds Nitrates {{inorganic-compound-stub