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[求助]
英文不行的我表示壓力很大 希望大家?guī)椭⒆g漢
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When it reaches -10° C, he keeps it at this temperature for a couple of hours, then filters out the crystals. They are rinsed a couple of times with ether or another solvent such as hexane, then, while still wet with ether, added to a large flask or beaker containing 2000 ml of water. They are dissolved by stirring, then the flask or beaker is cooled down to 0° C by packing it in ice mixed with salt. When it reaches this temperature, 200 ml of glacial acetic acid is added to it with vigorous stirring. The chemist must make sure that the temperature does not go up more than a few degrees while he is adding it. filters the crystals off it and rinses them a few times with water. The crystals must now be kept moist in order for them to be turned into. In a 2000 ml flask, he puts 700 ml of concentrated sulfuric acid. It is cooled down to -10° C by packing the flask in a mixture of salt and ice, then magnetic stirring is begun. The crystals are slowly added to the sulfuric acid. They must be moist, or he will get a mess. It takes about an hour to add the crystals to the sulfuric acid. Once they are added, the flask is heated in a pan of boiling water and swirled around to dissolve the crystals. After they have dissolved, the flask is heated for a couple more minutes, then removed from the pan of boiling water. It is cooled down slowly to 0° C by first letting it cool down, then packing it in ice. chemist puts 1700 ml of water in a 3000 ml flask. Half of the sulfuric acid solution is added to it. It is heated in a pan of boiling water for a couple of hours. It is given a couple of good shakes every 15 minute |
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3樓2013-04-15 19:46:24
Rio2016
木蟲 (小有名氣)
- 翻譯EPI: 72
- 應(yīng)助: 28 (小學(xué)生)
- 貴賓: 0.013
- 金幣: 3301.7
- 散金: 25
- 紅花: 6
- 帖子: 300
- 在線: 243.3小時
- 蟲號: 1910117
- 注冊: 2012-07-25
- 專業(yè): 抗腫瘤藥物藥理
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
phu_grassman: 金幣+5, thanks 2013-04-12 08:53:47
飄落江南: 金幣+25, 翻譯EPI+1, ★★★★★最佳答案 2013-04-15 19:43:25
phu_grassman: 金幣+5, thanks 2013-04-12 08:53:47
飄落江南: 金幣+25, 翻譯EPI+1, ★★★★★最佳答案 2013-04-15 19:43:25
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When it reaches -10° C, he keeps it at this temperature for a couple of hours, then filters out the crystals. 當它達到-10° C，在這個溫度保持兩小時，然后濾掉結(jié)晶物。 They are rinsed a couple of times with ether or another solvent such as hexane, then, while still wet with ether, added to a large flask or beaker containing 2000 ml of water. 用乙醚或其他溶劑例如正己烷沖洗兩次，然后，保持帶有乙醚的濕的狀態(tài)，并轉(zhuǎn)移到一個帶有2000ml水的大瓶或燒杯中。 They are dissolved by stirring, then the flask or beaker is cooled down to 0° C by packing it in ice mixed with salt. When it reaches this temperature, 200 ml of glacial acetic acid is added to it with vigorous stirring. 攪拌使其溶解，然后把瓶子或燒杯埋到冰鹽混合物中使其降到 0° C 。當它降到這個溫度，向里面加200 ml 冰醋酸，邊加邊攪拌。 The chemist must make sure that the temperature does not go up more than a few degrees while he is adding it. filters the crystals off it and rinses them a few times with water. 操作者必須保證，在添加的過程中不能使溫度升高幾度，濾去結(jié)晶物，用水沖洗幾次。 文章不難、、自己試譯下吧 |
2樓2013-04-11 21:25:01
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