What does cobalt(II) chloride stand for?
Cobalt (II) chloride anhydrous (with no water molecules attached) Cobalt (II) chloride, also known as cobaltous chloride and cobalt dichloride, is a chemical compound. It contains cobalt in its +2 oxidation state. Its chemical formula is CoCl 2. It contains cobalt and chloride ions .
What is the chemical formula for cobalt II hydroxide?
Chemical compound. Cobalt (II) hydroxide or cobaltous hydroxide is the inorganic compound with the formula Co (OH) 2, consisting of divalent cobalt cations Co2+. and hydroxide anions HO−. . The pure compound, often called the "beta form" (β- Co (OH) 2) is a pink solid insoluble in water.
What is the formula for cobalt II chlorate?
Cobalt(II) chlorate is a chemical compound with the formula Co(ClO 3) 2.. It is formed by a double displacement reaction between cobalt(II) sulfate and barium chlorate, barium sulfate precipitates and cobalt chlorate can be crystallized out of the filtrate.. CoSO 4 + Ba(ClO 3) 2 → BaSO 4 + Co(ClO 3) 2. It is also possible to make it by the reaction of any chlorate with a cobalt(II) salt ...
What is the formula for cobalt II hydrogen carbonate?
Cobalt(II) carbonate is the inorganic compound with the formula CoCO 3. This reddish paramagnetic solid is an intermediate in the hydrometallurgical purification of cobalt from its ores. It is an inorganic pigment, and a precursor to catalysts. [4] Cobalt(II) carbonate also occurs as the rare red/pink mineral spherocobaltite. [5] Contents
What is the coordination of cobalt chloride?
At room temperature, anhydrous cobalt chloride has the cadmium chloride structure ( CdCl#N#2) (R 3 m) in which the cobalt (II) ions are octahedrally coordinated. At about 706 °C (20 degrees below the melting point), the coordination is believed to change to tetrahedral. The vapor pressure has been reported as 7.6 mmHg at the melting point.
Why is cobalt chloride used as an indicator for water in desiccants?
Because of the ease of the hydration/dehydration reaction, and the resulting color change , cobalt chloride is used as an indicator for water in desiccants . Niche uses of cobalt chloride include its role in organic synthesis and electroplating objects with cobalt metal .
What is the reaction of 1-norbonyllithium with the CoCl#N#2?
Reaction of 1-norbonyllithium with the CoCl#N#2 ·THF in pentane produces the brown, thermally stable cobalt (IV) tetralkyl — a rare example of a stable transition metal/saturated alkane compound, different products are obtained in other solvents.
What are the compounds of cobalt?
Compounds of cobalt in the +3 oxidation state exist, such as cobalt (III) fluoride CoF#N#3, nitrate Co (NO#N#3)#N#3, and sulfate Co#N#2(SO#N#4)#N#3; however, cobalt (III) chloride CoCl#N#3 is not stable in normal conditions, and would decompose immediately into CoCl#N#2 and chlorine.
What temperature does trimethylsilyl chloride evaporate?
Dehydration can also be effected with trimethylsilyl chloride: CoCl. 2 •6 H.
How to get dihydrate and hexahydrate?
The solid dihydrate and hexahydrate can be obtained by evaporation. Cooling saturated aqueous solutions yields the dihydrate between 120.2 °C and 51.25 °C, and the hexahydrate below 51.25 °C. Water ice, rather than cobalt chloride, will crystallize from solutions with concentration below 29%.
Is 2O a dihydrate or an anhydrous salt?
2O) 4 and two molecules of water of crystallization. This species dissolves readily in water and alcohol. The anhydrous salt is hygroscopic and the hexahydrate is deliquescent. The dihydrate, CoCl 2 (H 2 O) 2, is a coordination polymer.
What temperature does CoCl 2 6H 2 O react with?
All reactions were catalyzed by CoCl 2 ·6H 2 O at 70°C.
What solvent is used in the optimization of the reaction condition?
The highest reaction activity was achieved in the system using aqueous ethanol (1 : 1, H 2 O : EtOH) as a solvent in comparison to other solvents under similar reaction conditions (Table 3, entry 5).
Most recent answer
Dear Sv Mg, you're very welcome. Normally, cobalt (II) chloride itself is rather stable under normal conditions. However, you can't do anything wrong when you store the stock solution at 4 °C in the refrigerator.
All Answers (6)
Dear Sv Mg, for such experiments, the cobalt (II)chloride hexahydrate, CoCl 2 x6H 2 O, is used in very low concentrations such as 150 µM as listed in Table 2 in the Review article shown below. The paper is available on ResearchGate. The molar mass of CoCl 2 x6H 2 O is 237.93 g/mole.
Overview
Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl 2. The compound forms several hydrates CoCl 2·nH 2O, for n = 1, 2, 6, and 9. Claims of the formation of tri- and tetrahydrates have not been confirmed. The anhydrous form is a blue crystalline solid; the dihydrate is purple and the hexahydrate is pink. Commercial samples are usually the hexahydrate, which is one of the most commonly used cobalt compounds in the lab.
Properties
At room temperature, anhydrous cobalt chloride has the cadmium chloride structure (CdCl 2) (R3m) in which the cobalt(II) ions are octahedrally coordinated. At about 706 °C (20 degrees below the melting point), the coordination is believed to change to tetrahedral. The vapor pressure has been reported as 7.6 mmHg at the melting point.
Preparation
Cobalt chloride can be prepared in aqueous solution from cobalt(II) hydroxide or cobalt(II) carbonate and hydrochloric acid:
CoCO 3 + 2 HCl(aq) → CoCl 2(aq) + CO 2 + H 2O
Co(OH) 2 + 2 HCl(aq) → CoCl 2(aq) + 2H 2O
The solid dihydrate and hexahydrate can be obtained by evaporation. Cooling saturated aqueou…
Reactions
In the laboratory, cobalt(II) chloride serves as a common precursor to other cobalt compounds. Generally, diluted aqueous solutions of the salt behave like other cobalt(II) salts since these solutions consist of the [Co(H 2O) 6] ion regardless of the anion. For example, such solutions give a precipitate of cobalt sulfide CoS upon treatment with hydrogen sulfide H 2S.
Moisture indication
Cobalt chloride is a common visual moisture indicator due to its distinct colour change when hydrated. The colour change is from some shade of blue when dry, to a pink when hydrated, although the shade of colour depends on the substrate and concentration. It is impregnated into paper to make test strips for detecting moisture in solutions, or more slowly, in air/gas. Desiccants such as si…
Health issues
Cobalt is essential for most higher forms of life, but more than a few milligrams each day is harmful. Although poisonings have rarely resulted from cobalt compounds, their chronic ingestion has caused serious health problems at doses far less than the lethal dose. In 1966, the addition of cobalt compounds to stabilize beer foam in Canada led to a peculiar form of toxin-induced cardiomyopathy, which came to be known as beer drinker's cardiomyopathy.
Other uses
• Invisible ink: when suspended in solution, cobalt(II) chloride can be made to appear invisible on a surface; when that same surface is subsequently exposed to significant heat (such as from a handheld heat gun or lighter) the ink permanently/ irreversibly changes to blue.
• Cobalt chloride is an established chemical inducer of hypoxia-like responses such as erythropoiesis. Cobalt supplementation is not banned and therefore would not be detected by current anti-doping testi…
External links
• International Chemical Safety Card 0783
• National Pollutant Inventory – Cobalt fact sheet
• IARC Monograph "Cobalt and Cobalt Compounds"