Cobalt(II) chloride (CoCl₂) is a chemical compound composed of cobalt and chlorine. It is blue when anhydrous, and a deep magenta colour when hydrated- for this reason it is widely used as an indicator for water, for example in drying agents such as Silica gel. The magenta hexahydrate is probably the most familiar cobalt compound in the laboratory: A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. ... General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9 , 4, d Density, Hardness 8. ... General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ... Hydrates are compounds formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. ... This article describes water from a scientific and technical perspective. ... Some examples of silica gel sachets Silica gel is a granular, porous form of silica made synthetically from sodium silicate. ...

Cobalt(II) chloride hexahydrate

It is ionic and dissolves readily in water and alcohol, and it has the interesting property that a concentrated aqueous solution is red at room temperature, but becomes blue when heated^[4]. This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Drinking water This article focuses on water as we experience it every day. ...

Chemical properties

Since cobalt(II) chloride is soluble in water, it can be used to prepare a variety of cobalt salts, e.g.,

CoCl₂(aq) + K₂S(aq) → CoS(s) + 2 KCl(aq) Drinking water This article focuses on water as we experience it every day. ... Drinking water This article focuses on water as we experience it every day. ... A solid is a state of matter, characterized by a definite volume and a definite shape (i. ... Overview The chemical compound potassium chloride (KCl) is a metal halide composed of potassium and chlorine. ... Drinking water This article focuses on water as we experience it every day. ...

The most stable oxidation state for cobalt is +2, so CoCl₂ is generally resistant to oxidation. However, in the presence of ammonia or amines, cobalt(II) chloride is easily oxidised (even by oxygen in the air to give a variety of stable cobalt(III) amine complexes, for example: The most fundamental reactions in chemistry are the redox processes. ... Ammonia is a chemical compound with the formula N H3. ... Ammonia Amines are organic compounds containing nitrogen as the key atom in the amine functional group. ... The most fundamental reactions in chemistry are the redox processes. ... General Name, Symbol, Number Oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16 (VIA), 2, p Density, Hardness 1. ... complex In chemistry, a complex is a structure composed of a central metal atom or ion, generally a cation, surrounded by a number of negatively charged ions or neutral molecules possessing lone pairs. ...

4 [Co(H₂O)₆]Cl₂ + 4 NH₄Cl + 20 NH₃ + O₂ → 4 [Co(NH₃)₆]Cl₃ + 26 H₂O Ammonium chloride or Sal Ammoniac (chemically ammonium chloride (NH4Cl); also zalmiak, sal armagnac, sal armoniac, and salt armoniack) is, in its pure form, a clear white water-soluble crystalline salt with a biting taste. ... Ammonia is a chemical compound with the formula N H3. ... General Name, Symbol, Number Oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16 (VIA), 2, p Density, Hardness 1. ... This article describes water from a scientific and technical perspective. ...

The reaction is performed in the presence of charcoal as a catalyst. General Name, Symbol, Number Carbon, C, 6 Chemical series Nonmetals Group, Period, Block 14 (IVA), 2, p Density, Hardness 2267 kg/m3 0. ...

Unlike most complexes, these are very slow to exchange ligands, so they are said to be kinetically inert. The German chemist Alfred Werner was awarded the Nobel prize in 1913 for his studies on a series of these Co(III) compounds, work which led to an understanding of the structures of such "coordination compounds". complex In chemistry, a complex is a structure composed of a central metal atom or ion, generally a cation, surrounded by a number of negatively charged ions or neutral molecules possessing lone pairs. ... In chemistry, a ligand is an atom, ion or functional group that is bonded to one or more central atoms or ions, usually metals generally through co-ordinate covalent bond. ... Alfred Werner (December 12, 1866 _ November 15, 1919) was a German Nobel prize-winning chemist. ... The Nobel Prizes (pronounced no-BELL or no-bell) are awarded annually to people who have done outstanding research, invented groundbreaking techniques or equipment, or made outstanding contributions to society. ... complex In chemistry, a complex is a structure composed of a central metal atom or ion, generally a cation, surrounded by a number of negatively charged ions or neutral molecules possessing lone pairs. ...

Regarding the existence of a simple Co(III) chloride, CoCl₃, the literature is contradictory. Ref. 2 describes such a compound as known, but ref. 1 (which is more recent) states, "Apart from ...CoF₃, ....the only known halides of cobalt are the dihalides."

Cobalt(II) chloride is a weak Lewis acid, reacting with chloride ion to produce salts containing the tetrahedral [CoCl₄]^2- ion. It forms complexes with ligands such as pyridine (see "uses"). In chemistry, a Lewis acid is any acid that can accept a pair of electrons and form a coordinate covalent bond, after the American chemist Gilbert Lewis. ... The chloride ion is formed when the element chlorine picks up one electron to form the anion (negatively charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and are also called chlorides. ... A tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. ... In chemistry, a ligand is an atom, ion or functional group that is bonded to one or more central atoms or ions, usually metals generally through co-ordinate covalent bond. ... Pyridine is a clear liquid with an odor that is sour, putrid, and fish-like. ...

Preparation

Cobalt(II) chloride may be prepared in its anhydrous form from cobalt metal and chlorine gas: General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9 , 4, d Density, Hardness 8. ... General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ...

Co(s) + Cl₂(g) → CoCl₂(s) General Name, Symbol, Number cobalt, Co, 27 Chemical series transition metals Group, Period, Block 9 , 4, d Density, Hardness 8. ... A solid is a state of matter, characterized by a definite volume and a definite shape (i. ... General Name, Symbol, Number chlorine, Cl, 17 Series halogens Group, Period, Block 17 (VIIA), 3, p Density, Hardness 3. ... Gas (actually as, part of the Gnu Binutils package) is the default Gcc Back-end. ... A solid is a state of matter, characterized by a definite volume and a definite shape (i. ...

The hydrated form can be prepared from cobalt(II) hydroxide or cobalt(II) carbonate with hydrochloric acid. The chemical substance hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ...

Uses

A popular use for cobalt(II) chloride is for the detection of moisture. For example, in the US calcium_sulfate is sold as a drying agent under the trade name Drierite  (http://www.drierite.com/catalog3/page4b.cfm). When cobalt(II) chloride is added as an indicator, the drying agent is blue when still active, pink when exhausted, corresponding to the anhydrous and hydrated forms of CoCl₂, respectively. Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. Chemical structure Gypsum from New South Wales, Australia Heating gypsum above approximately 150°C (302°F) partially dehydrates the mineral, by driving off exactly 75% of the water contained in its chemical structure. ...

In the laboratory, cobalt(II) chloride serves as a starting point for the synthesis of a variety of cobalt compounds. For example, the reaction of 1-norbonyllithium with CoCl₂ produces a brown, thermally stable cobalt(IV) tetralkyl^[5]- the only compound of its kind for which the detailed structure is fully known^[1]:

Reaction of anhydrous CoCl₂ with cyclopentadienylsodium in THF to give dark-purple cobaltocene, which can readily be oxidised to a Co(III) compound, the cobaltacenium cation which is isoelectronic with ferrocene. CoCl₂ also reacts with ligands such as pyridine to produce tetrahedral metal complexes: Tetrahydrofuran, also known as THF, hydrofuran, oxolane, oxacyclopentane, or furanidine, is a heterocyclic organic compound. ... Cobaltocene, Co(C5H5)2, also known as biscylopentadienylcobalt(II), belong to a group of organometallic compounds called metallocene which consists of a metal ion sandwiched between two cyclopentadienyl (cp) rings. ... This article is in need of attention. ... Properties Categories: Stub | Aromatic compounds | Organometallic compounds ... In chemistry, a ligand is an atom, ion or functional group that is bonded to one or more central atoms or ions, usually metals generally through co-ordinate covalent bond. ... Pyridine is a clear liquid with an odor that is sour, putrid, and fish-like. ...

CoCl₂ + 2 C₅H₁₀N → [CoCl₂(C₅H₁₀N)₂] Pyridine is a clear liquid with an odor that is sour, putrid, and fish-like. ...

Precautions

Toxic, cancer suspect agent.

Suppliers/Manufacturers

• Aldrich (http://www.sigmaaldrich.com)
• Strem (http://www.strem.com/code/index.ghc)
• Fisher (https://www1.fishersci.com/index.jsp)
• VWR (http://www.vwr.com/index.htm)
• Alfa (http://www.alfa.com/alf/index.htm)

Template: inorganic_stylesheet1 Overview History Chemical properties Preparation Uses Biological role Precautions Suppliers/Manufacturers References Template: Inorganic_stylesheet1 ...

References

1. N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.
2. Handbook of Chemistry and Physics, 71st edition, CRC Press, Ann Arbor, Michigan, 1990.
3. A. F. Wells, 'Structural Inorganic Chemistry, 5th ed., Oxford University Press, Oxford, UK, 1984.
4. The Merck Index, 7th edition, Merck & Co, Rahway, New Jersey, USA, 1960.
5. E. K. Byrne, D. S. Richeson, K. H. Theopold, Journal of the Chemical Society, Chemical Communications, 1491-2 (1986).
6. Hill, Petrucci, McCreary, Perry, "General Chemistry", 4th ed., Pearson/Prentice Hall, Upper Saddle River, New Jersey, USA.