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[求助]
几句和化学有关英文呵呵
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英文底子实在是不怎么样 像各位前辈求助了 先谢谢了 When the sodium hydroxide solution gets very hot, the chemist stops adding the reaction mixture to it until it cools down again.After all the black reaction mixture has been added to the sodium hydroxide solution, there is a brown liquid layer floating above the sodium hydroxide solution. This brown layer is free base. It also has a good deal of unreacted hydrochloride dissolved in it. This latter has to be neutralized because it will not distill in its present form. The 1000 ml flask is stoppered and shak vigorously for 5 minutes. This gets the hydrochloride into contact with the sodium hydroxide so it can react. [ Last edited by 飘落江南 on 2012-11-24 at 23:47 ] |
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phu_grassman
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3楼2012-11-25 12:29:22
【答案】应助回帖
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phu_grassman: 金币+2, thanks for your time. 2012-11-25 12:38:18
飘落江南: 金币+15, 翻译EPI+1, ★★★很有帮助 2012-11-25 14:38:32
phu_grassman: 金币+2, thanks for your time. 2012-11-25 12:38:18
飘落江南: 金币+15, 翻译EPI+1, ★★★很有帮助 2012-11-25 14:38:32
| 我的理解:当氢氧化钠溶液变得非常热的时候,停止向其中加入反应混合液,直到溶液冷却下来。将所有的黑色混合液都加到氢氧化钠溶液中之后,在溶液上方漂着一层棕色的液体层。这个棕色的液体层是游离碱。它也含有大量的未反应的氢氯化物溶解在里面。它之后会成为中性溶液,因为在现在的形态中不会被蒸馏出来。在密封好的1000ml的烧瓶剧烈搅拌5 min,使得氢氯化物与氢氧化钠接触而继续反应。 |

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