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Mercury(II) cation

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Identification
Molecular formula
Hg2+
CAS number
7439-97-6
IUPAC name
mercury(2+)
State
State

Mercury remains in a liquid state at room temperature, but its ion, the Hg2+ cation, would typically be found in aqueous solutions or solid compounds.

Melting point (Celsius)
-38.83
Melting point (Kelvin)
234.32
Boiling point (Celsius)
356.73
Boiling point (Kelvin)
629.88
General information
Molecular weight
200.59g/mol
Molar mass
200.5900g/mol
Density
13.5336g/cm3
Appearence

In its pure form, mercury is a heavy, silvery d-block element. Mercury ions in aqueous solutions form colorless solutions or white solids, depending on the anion it is paired with.

Comment on solubility

Solubility of Mercury(II) Compounds

Mercury(II), also referred to as Hg2+, exhibits unique solubility characteristics that are crucial well worth discussing. Its solubility can vary significantly based on the specific compound form it takes and the surrounding environmental conditions. Below are some key points regarding the solubility of mercury(II) compounds:

  • Water Solubility: Most mercury(II) salts are generally considered insoluble in water. However, exceptions exist, such as mercury(II) nitrate, which is more soluble.
  • Effects of pH: The solubility of mercury(II) compounds can be influenced by the pH of the water; for instance, increasing acidity tends to enhance solubility.
  • Presence of Ligands: The presence of complexing agents (like chloride or sulfide ions) can increase solubility significantly through the formation of soluble complexes.
  • Temperature Dependency: Generally, solubility tends to increase with temperature, although specific behavior can vary based on the compound.

In summary, while mercury(II) compounds are predominantly insoluble in water, the % of solubility can be altered through chemical interactions and environmental factors. Understanding these factors is essential in both laboratory settings and environmental chemistry, where mercury’s solubility can directly impact toxicity and mobility.

Interesting facts

Interesting Facts About Mercury (Hg2+)

Mercury, represented by the symbol Hg, is a fascinating element with a rich history and a unique presence in the world of chemistry. Here are some compelling facts about mercury in its +2 oxidation state:

  • Toxic Legacy: Mercury is notorious for its toxicity. It can have severe effects on the human nervous system, leading to symptoms like tremors, memory problems, and cognitive difficulties.
  • Industrial Uses: Despite its toxicity, mercury(II) compounds are used in various industrial applications including the manufacturing of thermometers, barometers, and fluorescent light bulbs.
  • Environmental Concerns: Mercury is a persistent pollutant found in ecosystems, particularly affecting aquatic life. It can bioaccumulate in fish, leading to serious health risks for humans who consume contaminated seafood.
  • Historical Significance: Mercury has been known since ancient times, often referred to as “quicksilver” due to its liquid state at room temperature. Alchemists revered it for its supposed magical properties and its vital role in the transmutation of metals.
  • Complex Chemistry: Mercury(II) can form numerous compounds, participating in reactions that showcase its amphoteric nature, enabling it to act both as an acid and a base.

Researchers continue to study mercury to understand its behavior in chemical reactions and its impacts on health and the environment. As cautionary tales abound regarding its dangers, it serves as a stark reminder of the balance between the usefulness of a compound and its potential hazards.

As the saying goes, "What goes in, must come out,” highlighting the inevitable consequences of mercury exposure. Thus, embracing safety and regulatory practices is critical when handling this enigmatic element.

Synonyms
Mercuric cation
Mercuric ion
mercury(2+)
Mercury, ion (Hg2+)
Mercury (II) ion
14302-87-5
Mercury ion (Hg2+)
Hg2+
mercury (II)
mercury(2+) ion
Hg++
ED30FJ8Y42
Hg(2+)
Mercury II
Mercury(2+) ions
Mercury (2+)
UNII-ED30FJ8Y42
mercury ion
Mercury dication
HgII
Hg+2
DTXSID9074933
SCHEMBL29404505
CHEBI:16793
NCGC00091572-02
NCGC00091572-03
C00703
Q26841278