實驗二 氧化還原滴定法 預報.doc

用 sncl 2 還原法分析褐鐵礦時加熱過 程

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SnCl 2 還原法分析褐鐵礦時,加熱過 應在 通風櫥 進行 4. 液處理︰酸性重 金屬廢 ( H 2 SO 4 H 3 PO 4 MnO 4 Cr 2 O 7 2 Sn 4+ Hg 2+ ) 、藥 性質: 1. stannous chloride SnCl 2 亞錫 ( ) ,其無水 是無色 斜方晶系 mp 246.8 bp 623 ,比 3.95 。 對 100g 水 的 溶 解 度 是 55.4g(18 ) 市 面 出 售 的 是 二 水 SnCl 2 •2H 2 O ,比重 2.710 mp 37.7 。可溶 於丙酮 冰醋 酸、 等,酸性溶 液具有強 的還原作用,可 分析試劑使用。 2. mercury chloride ( ) HgCl 2 俗稱昇汞 猛汞 ,因其具有 劇烈毒 性, 斜方晶系 的無色 ,比重 5.44 mp 277 280 時比重 4.44 304 昇華 ,對 100g 水溶 解度為 7.30g(25 ) 。可溶 、乙 、乙酸。 3. limonite 褐鐵礦,有 吸附 水的 氧化鐵礦物之 總稱 褐色或 色, 呈皮殼狀 鐘乳狀 土狀 。比重 含水量而定, 範圍大 約是 2.8~4.3
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