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Posts posted by UC

  1. Saponify either olive oil or high-oleic sunflower oil (not regular sunflower oil) with NaOH and water, then acidify the resulting soap. The water insoluble liquid that seperates is a mixture of the fatty acids that made up the oils, primarily oleic acid in the case of the two oils I mentioned. This can probably be used as is for ferrofluid.


    Instructions for making soap are readily available online. You want to use an excess of NaOH though to ensure complete saponification, while these recipes will call for an excess of oils to make a mild soap for use on skin.


    This is a handy calculator for figuring out amounts: http://www.soapcalc.net/calc/SoapCalcWP.asp


    Be sure to set "superfat" to 0%, then add a bit extra NaOH on top of what they suggest

  2. Why not utilize the old-as-dirt separation of isomers by crystallization with enantiomerically pure tartaric acid or other suitable chiral resolving compound? One of the salts should be significantly less soluble than the other. I did this in a freshman-level organic chemistry class with 1-phenethylamine and it works quite well.


    Clearly you don't need something of preparative scale. Recovery won't be 100% of the desired isomer, but it should be quite a bit cheaper than whatever method you wanted to use.


    Also, http://www.springerlink.com/content/j41636h201010558/ suggests that both isomers do have activity.

  3. On displaying and storing gallium. What kind of clear container does this stuff NOT stick to?


    It doesn't stick to plastic very well. Especially if the surface is clean and not covered with oxide scum, which might be your problem. As long as it stays solid, any sort of plastic should be fine.


    In fact, I used a plastic bag to clean mine off, by getting as much to stick as possible and pouring away the molten metal, then wringing out the stuff that stuck to recover clinging metal. I then used a clean plastic pipette to make small droplets of it on a plastic sheet and let them freeze.

  4. probably, but everytime i've used it from a hardware store its been pretty obvious that soemthing else was in it. either the solution turning brown and once even a chlorine smell when the other reactants didn't contain anything like chlorine.


    That's never been an issue where I am. A few percent of water and a bit of sodium carbonate is to be expected, but otherwise the material is clean if you buy carefully. Most brands have sodium nitrate, aluminum chips, dyes, etc. mixed in. I've been lucky enough to scout out two brands that are nothing but clean white prills, which I mainly use to make soap. If they had significant impurities in them, the oils wouldn't saponify properly and the bars would be greasy and soft. MSDS are always a good place to check before you buy. If the NaOH is caked in the container, it's also a bad idea to buy because a significant amount of water and CO2 has probably made it's way in.

  5. Take it from experience, the MnO2 in batteries is calcined and highly crystalline, resisting attack by acids, reducing agents, and almost anything you can throw at it in aqueous solution. One option is to simply finely powder the crude battery MnO2/C mix in a molten sodium or potassium hydroxide fusion with an oxidizing agent like a nitrate. Add very slowly. This will generate a melt of a manganate. Once cooled, this can be dissolved in acidic solution (don't use HCl or you'll get chlorine gas), and adding a reducing agent like bisulfite will convert it to soluble Mn (II) ions (be warned that manganese (II) sulfite trihydrate is a poorly soluble solid, so don't use a large excess). At this point, any remaining graphite (if it survived the molten nitrate) can be filtered off. However, this is *extremely* hazardous and unless you have experience working with molten lye and appropriate safety equipment, I absolutely do not recommend it.


    It's much easier, cheaper, and less time consuming to find a source of manganese (II) sulfate (used as a manganese source for hydroponics) or potassium permanganate and use that. Manganese dioxide from pottery supply places (used for glazes) is graphite free but is the same calcined difficult-to-use material as in the batteries.


    I've done the molten lye process before. It was a waste of my time to be honest. For a few dollars you can get more [ce] MnSO4*4H2O [/ce] than you'll ever use. Considering you don't need to pay for sodium hydroxide, sodium nitrate, acid, and bisulfite that way, the prices are probably fairly close.

  6. It'll work to an extent. Yeast needs added nutrients to grow properly for any length of time. Most likely he is indeed in for foul tasting slightly alcoholic sugar water. Making proper beer really isn't that hard and is vastly more pleasant. There's all sorts of info available online.

  7. Stainless Steel electrodes are relatively inert in this environment, and they're easily available in form of everyday kitchen implements, (knives, spoons, etc).


    Due to it's availability and low cost, SS is actually the preferred material in most electrolyser set ups commonly found on the internet. Rods and plates are relatively very easy to come by.


    Actually no, with chlorine around, you will damage stainless steel. SS is fine when using sodium hydroxide or sulfuric acid electrolyte, but nothing with halide ions present.


    I have dissolved samples of stainless steel with chlorine water for example

  8. The foundation of Science is built off Astrology!:doh:

    why was all scientist,astrologist?or mathemagicians? or alchemist,duh cause its all together!




    Can i at least get some real scientist here,please?


    Is the ,"moon" not the satellite to earth?


    As i promise,its NOT!

    and the English physicist, mathemation?

    Maybe now science

    Magic=Science four faces.They will show you cant every knowledge,wisdom and THEY ARE FALLEN!

  9. tricircle.jpg


    and to show in one way by the law of science how a triangle is a circle

    Merged post follows:

    Consecutive posts merged

    Another example using the law of science:




    What are you smoking and where can I get some? Also, science and astrology REALLY don't get along.


    inb4 the ban!

  10. Catalytic NaOH? But you need to deprotonate the benzyl carbon stoichiometrically. You end up with NaCl and H2O from the reaction as the base is consumed. Consider moving to a stronger base such as KOt-Bu or KH, which may necessitate a change in solvent.


    As for purification, there's always flash chromatography should all else fail. It may also be possible to gently oxidize the benzaldehyde and then shake the organic layer with 1M bicarbonate. Unless you have lots of polar sidechains on the stilbenes, they should greatly favor the organic layer, while the now benzoic acid will be readily removed as the benzoate

  11. I use this method to make me CuO. Actually anhydrous cuso4 will start to decompose at about 300C. The 650 figure is the temperature at which it decomps vigorously. The so3 fumes are indeed very choking and irritating. I make it in my room without a fumehood, i just open the window :). wouldn't it be possible to condense the so3 (boiling point 45C) and then add water?


    You do realize that SO3 fumes and sulfuric acid mists are considered a known human carcinogen, right?




    In addition, you are probably damaging everything else in the room.

  12. The glasses that Bruce suggests are the best option, but many places don't seem to allow them now. Uvex makes some of the better goggles (and cheaper ones, heck they make everything) for labs and if you have a bookstore at your school, they may sell them there.


    The "flex-seal" goggles (item S3410X) tend to fog up if the lab is warm (and if you generally fog up your goggles) but they're exceedingly comfortable.


    Item S3960C are the ones I wear and they look a bit more like ski goggles than lab goggles. They don't seem to fog up as much but they're not as comfortable.

  13. You'd need to run it in a divided cell, usually using something like a porous clay pot to contain one of the electrodes. What would you do with the chlorine gas sideproduct?


    Generating some hypochlorite is basically inevitable with any kind of aqueous cell. The best way to get NaOH from NaCl is to in fact make sodium, and react it with water seperately.

  14. Yeah, the "everyone" card huh?


    When a scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong. - Arthur C. Clarke


    Rail travel at high speed is not possible because passengers, unable to breathe, would die of asphyxia. - Dr Dionysys Larder (1793-1859), professor of Natural Philosophy and Astronomy, University College London.


    Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible. - Simon Newcomb - The Wright Brothers flew at Kittyhawk 18 months later.


    Everything that can be invented has been invented. - Charles H Duell, Commissioner U.S. Office of Patents, 1899


    A rocket will never be able to leave the Earth's atmosphere. - New York Times, 1936.


    There is practically no chance communications space satellites will be used to provide better telephone, telegraph, television, or radio service inside the United States. - T. Craven, FCC Commissioner, in 1961 - The first satellite for commercial communications went into service in 1965


    That's not even an argument. Proof or stfu is basically what it comes down to.

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