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About encipher

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    Maryland, USA
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  1. How is Phosphoric acid stronger than nitric acid? Phosphoric acid is clearly classified as a weak acid, and nitric as strong.
  2. I've been using Vista since the day it went RTM, and I absolutely love it. Now, before I can express my personal opinion towards the OS, I will make clear what exactly i do on it. I have several computers, one of which is an AMD X2 4800+, with 1 GB of DDR ram. It's my primary development computer. I run Visual Studio 2005, Microsoft Office suite, Multiple Adobe products (including premiere, after effects, photoshop, dreamweaver) for video post production purposes. I almost always have 10+ applications running simultaneously. I've also just started using Windows dreamscene. I'm also runni
  3. Generally, Epsom salt is actually the heptahydrate (seven waters) of Magnesium Sulfate MgSO4·7H2O
  4. Riogho, Thanks for that explanation, however I am interested not in Oxyacids but in Binary acids.. I am aware of the reasoning behind the strength an oxyacid in relation to electronegativity. I want to know the effect (if at all significant) on the acidic strength of a given GROUP, specifically, 7A. i.e. HF, HCl, HBr, HI Thanks
  5. I'm aware of that, my question however is regarding its effect on the strength of an acid going down a group.
  6. Hi, Does electronegativity play any significant role in the strength of the acids in a given group? (particularly Group 7A binary acids) I know the general trend across periods... But I'm curious as to wether or not EN has a significant effect down a group. Because HF < HCl < ..... Thanks
  7. Hi, I am interested in getting a quantitative result (mathematical figure) on the maximum "holding capacity" of water. i.e. If I had 1 L of H2O, whats the maximum concentration of ions can exist before a precipitate starts to form. And I am not talking about individual Ksp's of salts. Lets say you dissolve the maximum amount of NaCl in the 1L of H2O, then the max amount of KF, then LiI.. etc.. What is the limit of water in terms of the concentration of ions it can hold ? Thanks.. P.S. This is NOT a homework problem.. I'm just curious.
  8. encipher


    Don't forget the napalm using frozen orange juice and gasoline (fightclub).
  9. From Wikipedia (http://en.wikipedia.org/wiki/Sublimation_%28chemistry%29): The same happens during deposition (condensation is from gas to liquid, not solid). This does not mean that there doesn't exist a liquid phase for those compounds. Depending on temperature and pressure, there are a wide variety of chemicals that exhibit sublimation if the pressure of the environment changes. To understand more about this check out wikipedia's "phase diagram" page.
  10. Yes, however they are only suggested. However, the goal is to find labs that are more realistic, as in they will help students get a feel of what goes on in the chemical industry. Labs such as taking copper wire, placing it in a flame and watching it glow don't exactly do the job.
  11. Hi, I'm doing some volunteer work at a high school over the summer and will be preparing labs for the AP chemistry students next year. I'm looking for ideas on fun, interesting and informative labs that a high school student can do in class. Time is not an issue if it is a very good lab. I'm particularly looking for labs involving fractional distillation and simple distillation, at least one of each. Thoughts are greatly appreciated. I'm not looking for a whole write-up or procedure, as that is part of the work I will be doing. Labs that are visually appealing and/or intellectually st
  12. Looking through that thread, I think most of the people who posted on that thread there should stick with physics... =) Anyways, It doesn't answer my question of whether or not the reaction is shock sensitive, I mean I've seen millions of videos online of teens putting that stuff in coke bottles and blowing chunks of their hands off.. but would it simply go off merely by handling a container with the reactants?
  13. No, despite the title, this isn't a kewl post Last friday, at the local highschool where I live, a less than intelligent high school senior decided to make an infamous chlorine bomb, and leave it in the boy's bathroom. A teacher came in, saw an OPEN bottle and a horrible smell, picked it up (it was hot) and WOOSH, was engulfed in nasty fumes. He was taken to the hospital and treated. The suspect was apprehended by the police and it was found that he had mixed alcohol and chlorine pellets. My question is this: Why was there a big and sudden expulsion of gases when the co
  14. Look into Patinas for metals. IIRC, the 'mix' for blue is as follows: Mix sulfurated potash and ammonium chloride in about a quart of distilled water. I believe the ratio is 3:40 by mass. I'm no expert on this, but googling Patina formulas could help? Check out this wiki article: http://en.wikipedia.org/wiki/Patina
  15. Dewar/Vacuum flasks are commonly used to store cryogens (such as liquid Nitrogen or Oxygen). The following was taken from the Wikipedia article on Dewar flasks:
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