Science Fair Project Encyclopedia
Manganese(II) chloride
| Manganese(II)_chloride_tetrahydrate | |
| IUPAC name Manganese(II) chloride | |
| General | |
|---|---|
| Molecular formula | MnCl2 |
| Molecular weight | 125.84 amu (anhydrous)
197.91 amu (tetrahydrate) |
| Appearance | Pink solid (anhydrous)
Rose-coloured crystalline solid (tetrahydrate) |
| CAS number | [7773-01-5] (anhydrous)
[13446-34-9] (tetrahydrate) |
| MSDS | Manganese(II) chloride MSDS |
| Other names | |
| |
| Bulk properties | |
| Density | 2.98 g/cm3 (anhydrous) |
| Solubility | water: 72.3 g/100 cm3 (25 °C)
ethanol: soluble |
| Melting point | 652 °C (925 K) |
| Boiling point | 1190 °C (1460 K) |
| Hazards: | Toxic, irritant |
| Structure | |
| Coordination geometry | Octahedral (6-coordinate) |
| Crystal structure | CdCl2 |
| Hydrates | tetrahydrate |
| Related compounds | |
| manganese(III) chloride- unstable at room temp.
manganese(II) fluoride manganese(II) bromide manganese(II) iodide | chromium(II) chloride
iron(II) chloride technetium(IV) chloride |
Manganese(II) chloride (MnCl2) is a pink salt of manganese and chlorine. It occurs naturally as the mineral scacchite . It is ionic and it dissolves in water to give a solution with a pH of around 4.
| Contents |
Chemical properties
Since manganese(II) chloride is soluble in water, it can be used to prepare a variety of manganese salts, e.g.,
MnCl2(aq) + K2CO3(aq) → MnCO3 (s) + 2 KCl(aq)
It is a weak Lewis acid, reacting with chloride ion in ethanol to produce salts containing the [MnCl4]2- ion. It forms complexes with ligands such as triphenylphosphine (see "uses").
Preparation
Manganese(II) chloride may be prepared from manganese metal or manganese(II) carbonate reacting with hydrochloric acid. It is also produced when manganese(IV) oxide is heated with concentrated hydrochloric acid; this reaction was formerly used for the manufacture of chlorine.
MnO2(s) + 4 HCl(aq) → MnCl2(aq) + Cl2(g) + 2 H2O l)
Uses
In the laboratory, manganese(II) chloride serves as a starting point for the synthesis of a variety of manganese compounds. For example, manganocene may be prepared by reaction of MnCl2 with cyclopentadienylsodium in THF. MnCl2 reacts with ligands such as triphenylphosphine to produce metal complexes:
MnCl2 + 2 Ph3P → [MnCl2(Ph3P)2]
Precautions
Suppliers/Manufacturers
References
- N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.
- Handbook of Chemistry and Physics, 71st edition, CRC Press, Ann Arbor, Michigan, 1990.
- A. F. Wells, 'Structural Inorganic Chemistry, 5th ed., Oxford University Press, Oxford, UK, 1984.
- The Merck Index, 7th edition, Merck & Co, Rahway, New Jersey, USA, 1960.
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details