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secretyam木虫 (正式写手)
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[求助]
德语化学论文翻译（只要大体意思清楚就可以）
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由于复制过来文字出现变化，以图片格式上传。 德语论文翻译.png[ Last edited by nono2009 on 2015-8-26 at 08:47 ] |
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yifeng1206
铁杆木虫 (著名写手)
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Recall of the preparation method of nickel hexamine salt We have used the classic preparation method, with some modification for avoiding, in certain case, the degradation of the complexes. As a general manner, they are obtained, often around 0 °, by passage of a stream of desiccated ammonia on: a) the simple salt of nickel dehydrated (this is the case for the preparation of 氯化物和硫化物) or hydrated (溴化物，溴酸盐) or in syrupy mass (thiocyanate) deposited on the wafer of a filter crucible: 多余的水因此被吸干。The nickel salt can be also in concentrated aqueous solution (chlorate) or hydro-ammonia (碘和硝酸); b) on a 碱性盐, such as chromate; c) on a simple nickel chloride (for the preparation of高氯酸盐&过硫酸盐) or on the nickel hydroxide dissolved in the ammonia (preparation of normal 钼酸&钨) which we treat, furthermore the ammonia bubbling, by a concentrated solution of ammonium salt corresponding in ammonia. After filtration and wash with alcohol-ammonia, it is appropriate to sweep length by ammonia gas to dry and move resting water presented in the complex cation. The铬酸盐 & 过硫酸盐 should be prepared away from air and be conserved, as well as钨, in ammonia atmosphere. |
5楼2015-09-02 20:49:16
2楼2015-08-25 00:49:00
secretyam
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3楼2015-08-25 08:31:46
secretyam
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4楼2015-08-25 08:32:35
