Re: What is ammonium zincate
farooq_w_at_hotmail.com
Date: 12/29/04
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Date: 28 Dec 2004 21:24:43 -0800
Qi Wang wrote:
> Hello,
>
> I read United States Patent 5,349,074 describing a process to purify
> different biliary acids from hog biles, and encountered the following
> sentence:
>
> "The biliary acids solution is treated with an ammonium zincate
aqueous
> solution to precipitate the zinc salts of the same biliary acids."
>
> The meaning istself is clear but I don't what "ammonium zincate" is,
as I
> cannot find any info with Google, nor from any reagent catalogues.
>
> Any ideas? I am not a good chemist.
>
> Thanks in advance.
>
> Qi Wang
Apparently the author is referring to a solution of zinc hydroxide
dissolved in excess ammonia as ammonium zincate; or more practically
add enough ammonia just to precipitate Zn(OH)2 from any soluble zinz
salt; separate and dissolve in excess conc. ammonia solution. The name
is misleading though, since the hydroxide dissolves in ammonia forming
a compound similiar to copper-ammonia complex of type [Zn(NH3)n](2+)
not becasue of zincate ions.
"Organic Systhesis" also refers to ammonium zincate to "A solution of
20 g (0.15 mol) of zinc chloride (ZnCl2) in a mixture of 500 mL of
concentrated aqueous ammonium hydroxide"
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