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raivo

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Everything posted by raivo

  1. I found in old mineralogy book such kind of testing: take 3 parts of NaCO3 and one part of some unknown minerale that may be SiO2 or FeCr2O4 for example or some other inert oxide. Mix, heat as long as it melts and it turns into something that can be solved in acids for furter testing. Can anyone explain what exactly happens and what the product is.
  2. Pyrite is minerale that contains lot of sulphur. As far as i know it is not very hard to find. Many other minerals that are redish in color, but not crystallic, also contain FeS. Plain sulphur is harder to find.
  3. I do not belive that those are terrorists who discuss explosives in chem forums. This is no way dangerous phenomenon but imo a bit childish, because all we are done such kinda stuff when we were much younger than today. There are many other interesting and useful things in chem and its pity that most of them will usually not get half as much replyes than those dealing with pyro stuff.
  4. Most old HDD-s are surely aluminium. It must be some particular brand that used magnesium or maybe those really old HDD-s that had sizes less than 30 Mb? I do not know is this of interest for anyone but i have seen something in shop that was called "magnesium electrode for water boiler". It was aproximately 20 cm length & 1...2cm of diameter. And it was indeed very light magnesiumlike metal. Does anyone know more about such thing?
  5. Can anyone tell what is easyest way to know of some piece of metall that it is mostly Mg and not just Al?
  6. Here should not be molten sodium and high temperatures. Just slow electrolysis at room temperature.
  7. Anyone here tried to make alkaline metals by elektrolysis using some non-water solvent? I read from one russian book that such thing is possible. They used propylene carbonate as solvent for NaClO3 and got some fine sodium plating on cathode. It should be possible with some other solvents too as book stated that propylene carbonate gave BEST results... Any comments?
  8. Silvering is possible with AgNO3 solution but you need to use some silver piece as anode or your electrlyte will soon be unuseable. Speed of electrolytic reactions is directly proportional to current that passes through solution and is generally quite slow if you do not have tens or hundreds ampers of current. When plating something you can not use more current than some ampers per square decimeter of the plateable thing. Otherwise metal particles will not settle properly on surface and you will get very ugly coating ( in best case). One amper of current must flow through electrlyte during 26.8 hours to move one mole of substance ( in case ions are charged +1 or -1, otherwise speed is proportionally lower)
  9. I do not know the answer to you'r questions but i have met similar problems. Do all modern silcons and paints are equally good when using them in places where electrical insulation is of prime importance? Which are best common paints/ silicons in such case? And what to use if i need surface coating that is directly opsite to antistatic. ( When builidng static electricity machine for example... )
  10. You need to oxidise copper with hydrogen peroxide or some other thing. Copper oxide reacts with H2SO4. You may mix H2SO4 with hydrogen peroxide and add copper there. Another way is to put copper as anode into the H2SO4 solution and electrolyse it. There will be solution of copper sulphate then. I do not know about effectiiveness of these methods. These may be too costly for production.
  11. Thanks to all for info about crystals & mixed solutions! I do not know if this helps but Cr2O3 (that is used as polishing powder) is green in color, but does anyone know, will it react with any acids? Only reaction that i know with this substance is aluminothermic extraction of chrome metal. regards, Raivo
  12. Can anyone explain what happens when i try to grow (large) crystals using solution that contains mix of salts. Magnesium sulphate and copper sulphate for example. Do i get separate crystals of both compounds or something else?
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