yoshiharu198
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Baking Powder Versus Baking Soda
You are familiar with Baking Powder and Baking Soda and can not interchange these two important cooking ingredients, even though they both cause baked
good to rise.
can you suggest its chemical reaction which apply in cooking food
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elementcollector1
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NaHCO3 -> Na2CO3 + H2O + CO2 (not balanced)
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Latest Acquired: Cl
Next in Line: Nd
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kavu
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The main difference between baking soda and baking powder is the added sodium dihydrogenphosphate in baking powder. Both contain sodium bicarbonate
which releases carbon dioxide both upon heating and in reactions with acids. The added acidic dihydrogenphosphate salt can react with bicarbonate
anion in aqueous solution to produce carbon dioxide.
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Lambda-Eyde
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a) This is a spambot, ref. the other useless, gibberish posts this guy has "contributed" with. 95% possibility.
b) This is an actual person, unable to communicate properly. Nothing is lost if he's banned. 5% possibility.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
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bfesser
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b) …
i) This is a young person, possibly?
ii) There's a significant language barrier, as they're from Tokyo, Japan, in addition to being a biology student (read as
'mentally handicapped'). 99.9999% possibility.
<strong>Lambda-Eyde</strong>, relax. At least he/she isn't another SWIM'ing cook. I'd rather put up with the clueless, than the
brain-dead. Besides, if the admins banned every user who only contributes garbage, we wouldn't have an Energetic Materials section. 
<strong>yoshiharu198</strong>, read and compare the 'ingredient(s)' labels. <a href="http://en.wikipedia.org/wiki/Baking_soda"
target="_blank">Baking soda</a> <img src="../scipics/_wiki.png" /> is simply NaHCO<sub>3</sub>, whereas <a
href="http://en.wikipedia.org/wiki/Baking_powder" target="_blank">baking powder</a> <img src="../scipics/_wiki.png" /> is a mixture.
[Edited on 7/9/13 by bfesser]
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Endimion17
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Wasn't one of the baking powder's ingredients ammonium hydrogencarbonate? I don't remember those powders being acidic. They were always alkaline.
Adding water would yield carbon dioxide.
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bfesser
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You're probably thinking of <em><a href="http://en.wikipedia.org/wiki/Ammonium_carbonate" target="_blank">baker's
ammonia</a></em> <img src="../scipics/_wiki.png" /> (ammonium carbonate), although ingredients in baking powder do vary.
<img src="http://4.bp.blogspot.com/_Vq-FVhJjiLI/TNlUV48J3pI/AAAAAAAADMM/i3H3NT9Ui_E/s1600/baking%2Bpowder%2B059.JPG" width="300" />
[Edited on 7/9/13 by bfesser]
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SM2
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Is "tar tar emetic" a type of raw beef which will make you blow? It would be nice to know.
OK - I do find it interesting how the CO2 comes off the heated, finely milled bicarbonate. The soda mixture physically almost behaves as a liquid. I
suspect the fine milling and effects related to heat allow the solid mixture to appear this way during heating/off gassing.
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blogfast25
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Quote: Originally posted by SM2  |
OK - I do find it interesting how the CO2 comes off the heated, finely milled bicarbonate. The soda mixture physically almost behaves as a liquid. I
suspect the fine milling and effects related to heat allow the solid mixture to appear this way during heating/off gassing. |
The effect is similar to what's known as a 'fluid bed': finely ground solid particles through which a gas (usualy a reagent) is blown behaves a bit
like a boiling liquid. In heating technology very small glass prills ('ballotini') with hot air blown through them are used to heat up stuff because
the fluid bed transfers heat more quickly than hot air itself.
[Edited on 31-1-2013 by blogfast25]
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Endimion17
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I remember being in elementary school and heating sodium hydrogencarbonate in a steel pot to obtain dry sodium carbonate.
I was mesmerized by the behaviour of the fine powder. At first, it was like a surface of a volcanic region. There was the crust and shooting geysers,
but few gentle taps on the hot steel pot would turn it into a sea of powder, dancing and sloshing. It was not longer after that I've explained this as
behaviour of an approximated fluid due to the tiny size of the particles, the combination of their vibrations and, way more importantly, very hot air
and outgassing in the mixture. As usual, I had no one to share this with. You know the feeling... 
The gases play the main role here. After all of the water and CO2 is gone, sodium carbonate will slosh only if there's a positive change in heating
rate. If you heat the material at a constant rate, the temperature of the container stabilizes and there's little fluid behaviour. It is maximal when
the temperature is increasing because the air wants to get out. So you remove the flame and let the pot cool down a bit. The air rushes back in. Then
you start heating it again and you've got yourself new sloshing and geysers. It's fun to watch, but it's the best with fresh NaHCO3.
I've repeated it afterwards using dry mud. The results were the same, though the calcination yielded lots of noxious gas because of the organic
matter. Later, I used the powder to make a crucible.
Powders show interesting properties as they're complex systems. Sometimes solid, sometimes liquid, sometimes even gas-like.
I'd say one could make a decent scaled model of a surface of Io or Triton using a steel plate and a burner underneath. Some nice background, a HD slow
motion camera... I bet it would look a lot cooler than cheap, stupid CGI effects.
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bfesser
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The first time I heated NaHCO<sub>3</sub> to produce Na<sub>2</sub>CO<sub>3</sub>, I was so enthused by the
behavior of the powder, that I sealed the product in an ampoule to keep it dry. It retains a wonderful ability to flow, to this day. I'm glad I'm
not the only one who was impressed. Granular dynamics has long fascinated me.
<iframe sandbox width="560" height="315" src="http://www.youtube.com/embed/HKvc5yDhy_4" frameborder="0" allowfullscreen></iframe>
(I seem to recall requesting the paper this video is based on, some time ago.)
[edit]
It's not often that my memory is correct… <a href="viewthread.php?tid=15455&page=14#pid236639">The Paper</a>
[Edited on 1/31/13 by bfesser]
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Lambda-Eyde
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| Quote: Originally posted by bfesser | b) …
i) This is a young person, possibly?
ii) There's a significant language barrier, as they're from Tokyo, Japan, in addition to being a biology student (read as
'mentally handicapped'). 99.9999% possibility.
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May be, hence the "5%" in my previous post. It is not my wish to intentionally ban users who are challenged with language.
But if you look in his fucking signature (advertising) and his first two posts there shouldn't be any doubt that this is a spambot. Bad language can't
explain the nonsense in those posts. It is merely a well camouflaged spambot that uses words and expressions previously used in the thread to make it
look related to the topic at hand. I've seen it earlier.
This just in: 95,5 % of the world population lives outside the USA
Please drop by our IRC channel: #sciencemadness @ irc.efnet.org
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SM2
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off topic, but I sometimes cure my crazy glue with a liquid cold enough to cause sufficient(ly) fast contraction of the cyanoacrylate molecules to
cause a local friction, and therefore, local heating, and a seed cure. Almost like local high temperatures in an ultrasonically stimulated medium. I
suspect the molecules being suddenly dragged against one another, while being force compressed. The technique seems to work, but the cured glue can
look nasty!
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elementcollector1
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I've never seen my baking soda behave as described when I attempt to decompose it in the oven. What heat did you guys use to decompose the stuff?
Elements Collected:52/87
Latest Acquired: Cl
Next in Line: Nd
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Morgan
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I remember making a lot of ferrous oxalate in a 3 liter flask from ferrous sulfate and oxalic acid. When heated, how interesting it was to watch the
talc-like powder puff and slosh as it decomposed, dry but very fluid-like.
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bfesser
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<strong>SM2</strong>, they sell chemical 'accelerant' sprays for cyanoacrylate glues. It probably wouldn't be too difficult to synthesize
the active ingredients and prepare your own.
<strong>elementcollector1</strong>, I usually only prepared a small quantity, so I heated the sodium bicarbonate in a ceramic crucible
over an open flame.
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zed
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Another "Crack Cocaine" inquiry, if I have ever seen one.
Baking soda indeed! Young man, we know what you are planning to do with that stuff. Shameful!
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ScienceSquirrel
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Sodium bicarbonate really does dance if you heat it in a beaker on a hot plate as the water and carbon dioxide comes off.
I have used BP grade sodium bicarbonate and I have got a 98% yield, I guess that the product is better than 99% sodium carbonate.
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ScienceSquirrel
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| Quote: Originally posted by zed | Another "Crack Cocaine" inquiry, if I have ever seen one.
Baking soda indeed! Young man, we know what you are planning to do with that stuff. Shameful! |
Benefit of the doubt?
He wants to make sodium carbonate, not phenylacetone.
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blogfast25
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At a minimum I'd advise Zed not to pursue a career in the judiciary. Perhaps he agrees with a number of cases where home chemists have been suspected
of nefarious purposes on the grounds of possessing a 'marked' chemical?
Suspecting someone on the basis of talking about sodium carbonate on a hobby science forum: Kafka couldn't have dreamed it up!
[Edited on 2-2-2013 by blogfast25]
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