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huoyingfei铜虫 (小有名气)
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[求助]
液氮.操作
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请各位大虾帮帮我. In a 50 ml three-necked flask with the middle neck connected to a dry ice cold-finger condenser, The flask was flushed with N, for 15 min before NH3,(g) was introduced via the one neck and NH3,(l) allowed to condense on the cold finger. About 15 ml of liquid ammonia were condensed (- 77°C). The solution was stirred for 30 min with a magnetic stirrer and the NH, then allowed to evaporate (about 1 h) by removing the dry ice from the condenser. 谁做过这方面的试验,帮我看看怎么做,我新手,不知道该怎么做.关键是a dry ice cold-finger condenser,是什么,还有 NH3,(l) allowed to condense on the cold finger. About 15 ml of liquid ammonia were condensed (- 77°C). 多谢了 |
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8楼2007-10-08 10:16:57
huoyingfei
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2楼2007-10-06 12:27:59
yuxinghai455
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3楼2007-10-06 13:16:05
mooncakexzj
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| In a 50 ml three-necked flask with the middle neck connected to a dry ice cold-finger condenser 在50ml三颈瓶中间颈口连接干冰冷凝器。The flask was flushed with N, for 15 min before NH3,(g) was introduced via the one neck,在氨气通入以前，三口瓶应该通入氮气15分钟（应该是赶走空气）and NH3,(l) allowed to condense on the cold finger.液氨可通过干冰冷凝器冷凝。About 15 ml of liquid ammonia were condensed(- 77°C). 反应需要15ml左右的被冷却的液氨。 |
4楼2007-10-06 14:09:47
