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nirenjie0627金虫 (小有名气)
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在已知浓度的定量KCl溶液中，加入定量过量的四苯硼钠标准溶液，再用双季铵盐滴定剩余的四苯硼钠，终点时稍过量的双季铵盐与溴酚蓝形成的盐溶于含氯有机溶剂成蓝色，同时做不加KCl的空白试验。 准确量取氯化钾溶液20ml于50ml容量瓶中，加四苯硼钠标准溶液25ml，加水稀释至刻度，摇匀。干滤纸过滤，弃去初滤液，量取滤液10ml于150ml锥形瓶中，加溴酚蓝指示剂0.5ml,三氯甲烷10ml,用双季铵盐溶液滴定至下层有机相显蓝色。 另取50ml容量瓶,加入四苯硼钠标准溶液25ml，乙酸—乙酸钠缓冲溶液20ml，用水稀释至刻度，取此液10ml于150ml锥形瓶中，同上操作进行空白试验。 |
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A quantitative of known concentration of KCl solution, in which excess quantitative of sodium tetraphenylborate standard solution was added. The residual sodium tetraphenylborate was then titrated by double quaternary ammonium salt. The formation of bromophenol blue and slightly quantitative of double quaternary ammonium salt at the titration end-point gave a chlorinated organic solvent soluble salt, which gave a visible color of blue in this solvent. Repeat the above procedure as a blank test without adding KCl. 稍作修改。 |
4楼2010-11-06 23:19:04
| A quantitative of known concentration of KCl solution, in which excess quantitative of sodium tetraphenylborate standard solution was added. The residual sodium tetraphenylborate was titrated by double quaternary ammonium salt. The formation of bromophenol blue and slightly quantitative of double quaternary ammonium salt at the titration end-point gave a chlorinated organic solvent soluble salt, which gives a visible color of blue in this solvent. Repeat the above procedure as a blank test without adding KCl. |
2楼2010-11-06 23:14:50
3楼2010-11-06 23:16:34
