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[ Last edited by nono2009 on 2015-8-26 at 08:47 ]

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liyiping36

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secretyam

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2Â¥: Originally posted by liyiping36 at 2015-08-25 00:49:00
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3Â¥2015-08-25 08:31:46
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secretyam

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2Â¥: Originally posted by liyiping36 at 2015-08-25 00:49:00
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4Â¥2015-08-25 08:32:35
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yifeng1206

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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 ¡ã, by passage of a stream of desiccated ammonia on:
a) the simple salt of nickel dehydrated (this is the case for the preparation of ÂÈ»¯ÎïºÍÁò»¯Îï) or hydrated (ä廯ÎäåËáÑÎ) or in syrupy mass (thiocyanate) deposited on the wafer of a filter crucible: ¶àÓàµÄË®Òò´Ë±»Îü¸É¡£The nickel salt can be also in concentrated aqueous solution (chlorate) or hydro-ammonia (µâºÍÏõËá);
b) on a ¼îÐÔÑÎ, such as chromate;
c) on a simple nickel chloride (for the preparation of¸ßÂÈËáÑÎ&¹ýÁòËáÑÎ) or on the nickel hydroxide dissolved in the ammonia (preparation of normal îâËá&ÎÙ) 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¸õËáÑÎ & ¹ýÁòËáÑÎ should be prepared away from air and be conserved, as well asÎÙ, in ammonia atmosphere.
5Â¥2015-09-02 20:49:16
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