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the guy

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  1. I'm afraid I don't have the necessary temperatures at my disposal. I may just keep it as it is. The last couple of times I've used it were for preparing Ca(OH)2 anyway, so for this purpose it will still suffice. And a modicum of CaCO3 contamination shouldn't be a problem...
  2. Hello all. I'm in a bit of a quandary with my tub of calcium oxide. I can only assume that at some point I have failed to seal the lid properly, or have dislodged it a bit when moving it. Whatever the cause, I discovered earlier today that the contents have swelled and lifted the lid to precarious new heights, and the resulting powdery tower looks worryingly delicate. I have two options at this stage. I can either order a new, larger sealable tub to house it - though since the purity has obviously been compromised it will have limited uses - or I can attempt to dispose of it.
  3. I keep reading that medium chain triglycerides have a laxative effect, but I can't find an explanation for this anywhere. What actually causes this? Thanks in advance for any help
  4. But if the calcium chloride is dissolved in the ethanol first, and then the water is added?
  5. So I know that the dissolution of calcium chloride in water is exothermic. I also know that calcium chloride can be used to 'dry' organic solutions by removing water, indicating that it still has a high affinity for water over other solvents. What I was wondering is whether the reaction with water is still exothermic when it is already dissolved in another solvent. And if so, is it lessened at all? I.E if I added water to a solution of calcium chloride in anhydrous ethanol, would an exothermic reaction occur? And, if so, would it be less exothermic than the addition of water to the solid
  6. What sort of temperature would be optimum for hot iron oxidation? Nothing speaks against Liquid Nitrogen in terms of use, in fact it would be ideal. What you don't seem to understand is that, at least where I live in the North of England, it is not at all easy to get a hold of. It's just not around. I've read all over the internet about welding supply stores stocking the stuff but they don't here. I don't know if it's just an American thing or if I'm just unlucky, but that's the case. There are no nearby cryogenic medical supply places or anything of the sort and, aside from ordering deliv
  7. John Cuthber - hmm, slow may not be good enough. Unfortunately it's not just oxygen-free air I need, or I'd be using bicarb and vinegar or yeast. As it happens I am returning to an old problem, producing a stream of pure nitrogen - http://www.scienceforums.net/topic/70338-preparation-of-nitrogen/ Since I am struggling to find a purchase-able nitrogen canister that isn't the size of my mother, and liquid nitrogen isn't as easy to come by as everyone seems to be making out. I was hoping that an efficient oxygen absorber in tandem with sodium hydroxide to remove CO2 might be an option, but it's
  8. Evening all. Basically my intention is to remove the oxygen from a stream of air, either cheaply or preferably with the materials I have to hand. After doing a bit of research and writing off expensive options like pyrogallol, I think I have put together a design which might work. I wonder if you might give it a once-over for me? Basically it would be a cylinder filled with steel wool and finely powdered calcium chloride, well packed and interspersed within the wool. The idea is that the calcium chloride will remove moisture from the air (a handy side-effect) and, in doing so, provide the
  9. the guy


    Apologies, I should have been more specific. I was meaning a pulse as might be generated by a large non-nuclear electromagnetic pulse device, such as an explosively pumped flux capacitor or the such like
  10. Just a plot point that needs verifying for something that I'm writing. To cut a long story short, warfarin is secretly cut with cocaine and administered to a (drug-using) victim in this way. I would just like to confirm before I include this that it would actually work; i.e. can warfarin be absorbed into the blood in this manner? Thanks in advance for any help
  11. the guy


    For the purposes of a sci-fi story, what would be the effects of a large nearby electromagnetic pulse on a car, and what would it take to get it running properly again? Thanks in advance for any help
  12. I would like to do a small experiment with calcium chloride. I happen to have some in my possession but it is in the form of little flakes, and I need it to be in a very fine powder form. I'm assuming that the reason for the flakiness lies in its water-absorbing properties. Would I be right in thinking this and, if so, would 'baking' it in the oven on a high temperature dehydrate it enough for it to be finely powdered? Thanks in advance for any replies.
  13. I have read that carrageenan solution causes swelling/ oedema upon subcutaneous injection. I was wondering, could it cause swelling/ oedema upon contact with mucous membranes such as the lining of the mouth/ respiratory tract, in high concentration?
  14. In the case of hypothyroidism (at least those cases which result from iodine-deficiency) I am confused as to why it lowers levels of growth hormone. I would expect, since there is a lack of iodine and therefore thyroid hormone, that thyroid stimulating hormone levels would rise. But for this to happen there would have to be lowered levels of somatostatin which would, in turn, result in high levels of growth hormone. This is is evidently not the case though, since iodine-deficiency induced hypothyroidism is shown to cause stunted growth. Can someone please help me explain this?
  15. Actually, the reason I wanted the copper hydroxide is for the synthesis of the ammonia-copper complex. So if I were to dissolve the mixture in ammonia, would it be easy to separate this from the CaSO4?
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