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|Section2= |Section3= |Section4= }} Ammonium iron(II) sulfate, or Mohr's Salt, is the inorganic compound with the formula (NH4)2Fe(SO4)2·6H2O. Containing two different cations, Fe2+ and NH4+, it is classified as a double salt of ferrous sulfate and ammonium sulfate. It is a common laboratory reagent. Like the other ferrous sulfate salts, ferrous ammonium sulfate dissolves in water to give the aquo complex ()2+, which has octahedral molecular geometry.〔 This compound is a member of a group of double sulfates called Schönites or Tutton's salts. which form monoclinic crystals and have formula M2N(SO4)2.6H2O. This group can mix metals and crystallise on other schönite crystals. == Applications == In analytical chemistry, this salt is preferred over other salts of ferrous sulfate for titration purposes as it is much less prone to oxidation by air to iron(III). The oxidation of solutions of iron(II) is very pH dependent, occurring much more readily at high pH. The ammonium ions make solutions of Mohr's salt slightly acidic, which slows this oxidation process.〔(【引用サイトリンク】title=Ammonium Ferrous Sulphate 100 g (Mohr’s Salt) )〕 Sulfuric acid is commonly added to solutions to reduce oxidation to ferric iron. Mohr's salt is named after the German chemist Karl Friedrich Mohr, who made many important advances in the methodology of titration in the 19th century. It is used in the Fricke's dosemeter to measure high doses of gamma rays. 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「Ammonium iron(II) sulfate」の詳細全文を読む スポンサード リンク
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