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|Section2= |Section3= |Section7= |Section8= }} Manganese(II) chloride describes a series of compounds with the formula MnCl2(H2O)x, where the value of x can be 0, 2, or 4. The tetrahydrate is the most common form of "manganese(II) chloride" and is represented by the formula MnCl2·4H2O, but the anhydrous form and dihydrate MnCl2·2H2O are also known. Like many Mn(II) species, these salts are pink, with the paleness of the color being characteristic of transition metal complexes with high spin d5 configurations.〔N. N. Greenwood, A. Earnshaw, ''Chemistry of the Elements'', 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.〕 ==Preparation== Manganese chloride is produced by treating manganese(IV) oxide with concentrated hydrochloric acid. :MnO2 + 4 HCl → MnCl2 + 2 H2O + Cl2 This reaction was once used for the manufacture of chlorine. By carefully neutralizing the resulting solution with MnCO3, one can selectively precipitate iron salts, which are common impurities in manganese dioxide.〔.〕 In the laboratory, manganese chloride can be prepared by treating manganese metal or manganese(II) carbonate and hydrochloric acid: :Mn + 2 HCl → MnCl2 + H2 :MnCO3 + 2 HCl → MnCl2 + H2O + CO2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Manganese(II) chloride」の詳細全文を読む スポンサード リンク
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