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hypervalent_iodine last won the day on April 26

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About hypervalent_iodine

  • Rank
    Malevolent Viper

Profile Information

  • Gender
    Not Telling
  • Interests
    Organic and medicinal chemistry
  • College Major/Degree
    Bachelor of Science (Hons I) - Chemistry
  • Favorite Area of Science
    Organic Chemistry
  • Occupation
    Ph.D. student

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77121 profile views
  1. two TRIPLE DNA Bases

    ! Moderator Note You already have a thread on this. Do not open more. Closed.
  2. Nomenclature of stereoisomers

    No problems!
  3. Nomenclature of stereoisomers

    You haven't assigned your priorities correctly. Remember that you need to work out only one atom at a time. In your case, the first atoms out from the stereocentre are C, C, C, and H (atoms in red). Obviously the H is the lowest priority here, but you cannot distinguish between three C's. You therefore need to go one further to see if you can differentiate. To do this, you consider the atoms bonded to each atom connect to the stereo centre, and rank them. In the image below, these are the blue atoms. a. C, H, H b. C, C, H c. H, H, H You then look at where they first differ. Atom c. is different from a. and b. in that its highest ranked atom is a H. This group is therefore the lowest priority of the three. Atom a. and b. first differ at the second highest ranked atom. In this case, atom b. has a C, where a. has a H. Since carbon is higher priority, atom b. is considered higher priority than a. The order is thus, b., a., c., then the H, making it an (S) isomer.
  4. Calculating pH Help

    Right. So your problem is two fold. The first problem is that you put your acid concentration on the numerator side of the fraction. The second problem is that you have misunderstood what is meant by base in the equation. It is actually conjugate base - ie the deprotonated form of the acid. Not NaOH. The NaOH is there to react with your acid. Once it has reacted, you will have a certain concentration of base left, and then because there is less base than acid, you will have some excess acid. Those concentrations are what you use.
  5. Calculating pH Help

    Just to add, I performed the calculation myself and got the correct answer. If you could show your working, that would help to figure out where the issue is.
  6. Calculating pH Help

    Can you show how you get your answer? Honestly, it's not a huge difference. Are you solving using a specific formula or something else?
  7. Topic grading...

    You mean do the stars convert to rep points? If so, then no.
  8. Sleeping with the windows closed? Earplugs?

    I've never had a problem with dogs, but I do have a partner who snores. He's very loud. Sometimes I have to gently kick him to get him to stop, but I've found earplugs block most of it. I like the mouldable swimmers ones personally. They've also been great for when my new neighbors have friends over for drinks on their back patio (the noise goes directly into my room, regardless of how little they make). I wouldn't worry too much about having the window shut. I also like to sleep with mine open for fresh air, but I don't notice any difference in how I feel in the morning with it shut.
  9. Bad knees

    ! Moderator Note It is best you seek advice from your doctor, not the internet.
  10. The 'Intellectual Conscience', by Friedrich Nietzsche

    ! Moderator Note Dave Moore, As mentioned by Area54, this is a discussion forum, not your blog. Participating here necessitates that you engage with other members and, well, participate. Do not reply to this mod note within the thread. Please use the report post function, or PM a member of staff if you take issue with this.
  11. Can you help with the Henderson-Hasselbalch question, please? 

  12. Standardization of HCl using NaOH and Na2CO3

    That looks good to me. Well done!
  13. disertation

    That's correct. Some degrees have a compulsary honours year, but here at least the standard BSc is a three year degree with an optional fourth year for honours.
  14. disertation

    In Australia your honours year is a research intensive year with some minor coursework, culminating in a thesis. You also have to write a literature review / research proposal. It's a non compulsory year, but it is required to enter into a PhD (unless you have a Masters, though they aren't common here in the sciences).
  15. Standardization of HCl using NaOH and Na2CO3

    Okay, so here's my suspicion. They made a typo. If you use 1.298 g of Na2CO3 instead of 0.1298 g, you get the correct answer. My advice is to contact your course coordinator and check with them if this is the case.