spirocycle
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BZ reaction problem
I followed the procedure to make the stock solutions explained in the attached document, and tried a couple recipes, namely the last one on the list.
It didnt work at all, the ferroin stayed red the whole time.
I tried it again with less water, and then it stayed blue the whole time.
I tried with an intermediate amount of water, and it barely changed back and forth but with none of the beautiful patterns expected.
I tried another recipe that included some bromide initially, and I got what appeared to be iron filings precipitate out, and bubbles of what smelled
like bromine produced.
does anyone have any experience with this reaction?
do the solutions need to be added in a specific order?
is there another, better recipe to use?
just to clarify, I'm using bromate/bromide and malonic acid
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watson.fawkes
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As of this reply,
there's no attached document and no explanation of the acronym "BZ", and I have no idea what reaction you're talking about.
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ScienceSquirrel
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Mood: Dogs are pets but cats are little furry humans with four feet and self determination! 
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It is the Belousov-Zhabotinsky reaction, understandably called the BZ reaction as it hardly rolls off the tongue unless you are Eastern European! 
http://en.wikipedia.org/wiki/Belousov%E2%80%93Zhabotinsky_re...
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DDTea
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I thought he was referring to Agent Buzz for a minute (3-quinuclidinyl benzilate).
"In the end the proud scientist or philosopher who cannot be bothered to make his thought accessible has no choice but to retire to the heights in
which dwell the Great Misunderstood and the Great Ignored, there to rail in Olympic superiority at the folly of mankind." - Reginald Kapp.
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not_important
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Haven't ever seen a preferred sequence of mixing, except that ferroin is added last, after the bromine colour has faded. One reference is http://www.chemie.uni-regensburg.de/Organische_Chemie/Didakt...
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spirocycle
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Sorry about the lack of paper, I didnt check to make sure the upload worked correctly, and the file is 4mb so it wont attach
it can be found here: http://pubs.acs.org/doi/abs/10.1021/ed068p320
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The WiZard is In
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Quote: Originally posted by spirocycle  | | I followed the procedure to make the stock solutions explained in the attached document, and tried a couple recipes, namely the last one on the list.
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Next time your wander into the building with all the books
arranged horizontally ... if you have stack access pluck it off
the shelf or speak kindly upon a librarian and eye ball :—
Bassam Z. Shadhashiri
Chemical Demonstrations for Teachers of Chemistry
U of Wisconsin Press 1985
Volume 2 - Classic BZ and 4 modified procedures.
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spirocycle
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I've read that book, but the procedure explained is for the color changing solution.
I'm doing more of this:
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src="http://www.youtube.com/v/IBa4kgXI4Cg?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always"
allowfullscreen="true" width="640" height="385"></embed></object>
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