VSEPR_VOID
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Copper Ferrocyanide, Copper Hydrogen Ferrocyanide Tetrahydrate, and Sodium Copper Hydrogen Ferrocyanide
A quick comment on the source of my reagents and limitations. Feel free to skip this as it does not pertain to the topic directly. I have been given
nearly free range in the lab at school with a few rules (no energetic materials at the top). I have been researching various copper salts I could
prepare in my free time for fun. I have decided to begin with copper 2 nitrate trihydrate, which I have already prepared by the reaction of copper
(removed from old power cables and wires) and nitric acid (pictures below show a concentrated solution of this salt and and later the solution after
being boiled down and cooled to room temperature). Wanting to maintain my promise to not cause a sudden unplanned rapid disassembly of the fume hood I
will not keep to my original plan to synthesize tetramine copper 2 nitrate.
According to "http://iron.atomistry.com/copper_ferrocyanide.html", the salt copper ferrocyanide (Cu2[Fe(CN)6]) may be prepared by a double
displacement reaction, "by mixing solutions of copper sulphate and potassium ferrocyanide, the former salt being present in excess" The copper
ferrocyanide being a brown precipitate. This is supported by the following source: http://www.public.asu.edu/~jpbirk/qual/qualanal/copper.html
Question 1) Would I be able to substitute copper nitrate for copper sulfate? Is there a reference table of the hierarchy of anion strength, or
something analogous I can be provided a link to?
The first site (iron.atomistry.com) continues with the claim that an acid salt of copper ferrocyanide can be prepared by boiling the brown precipitate
in an acid.
"When boiled with concentrated nitric acid, a ferroferricyanide is obtained of the composition
Cu7[Fe'Fe''(CN)22]2.30H2O.
When boiled with concentrated hydrochloric acid, the acid salt CuH2Fe(CN)6.4H2O, is obtained as a yellow, insoluble substance."
Question 2) Is there any other documentation on this?
Question 3) Why is there no liberation of hydrogen cyanide but instead such a strange reaction? I can not find any other source referring to these
acid salts. (note: I am using duckduckgo as a search engine)
The website continue,
"this, when digested with solutions of the chlorides of the alkali metals, liberates hydrochloric, acid, yielding alkali cupriferrocyanides. Thus, for
example, with potassium chloride: -
CuH2Fe(CN)6 + 2KCl = CuK2Fe(CN)6 + 2HCl."
I am interested in trying this out and developing a procedure these copper compounds. If anyone has any insight into this or has even prepared similar
salts (copper ferrocyanides, acid salts, and so on) I would much appreciate hearing it.
 
[Edited on 3-3-2018 by VSEPR_VOID]
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Boffis
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I think that all of you question will be answered by reading:
The chemistry of Cyanogen compounds and the manufacture and estimation by H E Williams 1915
While this book is old is spectacularly comprehensive and can be downloaded from t'internet there are over 50 pages dedicated to ferrocyanides! I have
both digital and hard copies and they are amongst my most used books. I could upload it but its about 8MB. You can download it from several site so do
a search on it.
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VSEPR_VOID
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Thank you. How do you do research or look for reliable and interesting sources?
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Boffis
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I have a large number of basic chemistry books. When I am drawn into a new field I simply read-up on the field in these books. I bought nearly all of
them from Amazon, though I have since downloaded many in digital form. They were mostly cheap because they are mostly pre-1960. I find that older
chemistry books are more fact based and well referenced were as the more recent books tend to be more theoretically driven and less well referenced to
specific compound types. While you definitely need the latter text to understand what is going on I often find that abstract theories are hard to
comprehend. Sometimes when you want to prepare a compound the older works are better because they give actual details that can't easily be worked out
from theory. On the other hand theory sometimes opens up possibilities that need to be followed up with experiments and that's where the fun starts.
By the way, I may spend weeks reading and planning before I start mixing chemicals.
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VSEPR_VOID
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Quote: Originally posted by Boffis  | I have a large number of basic chemistry books. When I am drawn into a new field I simply read-up on the field in these books. I bought nearly all of
them from Amazon, though I have since downloaded many in digital form. They were mostly cheap because they are mostly pre-1960. I find that older
chemistry books are more fact based and well referenced were as the more recent books tend to be more theoretically driven and less well referenced to
specific compound types. While you definitely need the latter text to understand what is going on I often find that abstract theories are hard to
comprehend. Sometimes when you want to prepare a compound the older works are better because they give actual details that can't easily be worked out
from theory. On the other hand theory sometimes opens up possibilities that need to be followed up with experiments and that's where the fun starts.
By the way, I may spend weeks reading and planning before I start mixing chemicals.
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Are the older texts expensive to purchase?
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DraconicAcid
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Depends on where you look. Difficult to find, though.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Boffis
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For hard copies try Amazon. A lot of really old c100 years or more are now available as facsimile reprints virtually to order for about $30. If you
don't mind old library books with their associated "Withdrawn" stamps all over the place you can often get them for less than $5. Books that have been
standard university text books in the past are usually particularly abundant and therefore cheap, even if they are only 5-10 years old. Also check
online, there are many digital textbooks out their on sites like b-ok.org. I find paper books easier to read but that's personal.
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VSEPR_VOID
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Where do I get said old library books?
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