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KATHERINEwjw

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  • Exams
    May 2019
  • Country
    China
  1. Right. Sorry. That was definitely a typo:0
  2. Thanks for the advice! My textbook does not teach anything about the Henderson-Hasselbalch equation, but it does mention that pKa=PH at equivalence point. But doing this would be too simple an IA, so I'm looking for alternative approaches to determine the pKa...
  3. KATHERINEwjw

    Chemistry HL IA ideas?

    I don't think it's stealing. Academic honesty in IA is about not having same/similar topics with your classmates. Your friend obviously can't do an IA about that anyway. Besides, her exploration will be much more in-depth than yours.
  4. I can also go from pH to pKa right? That's how I can determine the pKa of the acid. But how do I find the concentration of its conjugate base through a titration? Would the conjugate base need to be extracted and titrated separately?
  5. KATHERINEwjw

    Geography IA topic choice HELP!

    Please please please can someone help???
  6. KATHERINEwjw

    Geography IA topic choice HELP!

    Hi, I'll have to decide on our ia topics by tomorrow! I came up with 2 potential ia topics but can't decide which one to do: Does my city fit the multi-nuclei model? What factors affect the sphere of influence of the local supermarket/store? With the 1st one I'll need to find certain features in the, say 5-6, potential commercial centers in my city, and use the definitions to prove that they are indeed CBDs, and then piece them together. There're a few classmates with similar topics and we're supposed to go in groups, but still it might be pretty tough fieldwork? With the latter I'll first measure the sphere of influence, and then come up with affecting factors, like the types of goods they sell. Problem is, the effect of sth on sth is usually pretty relative, means there has to be a range of variables? Like I need to go from the grocery to the supermarket and to a department store? That would be too much for 2500 words. Has anyone done similar topics before? Any tips on that? Which one should I do??? Thanks a lot.
  7. I saw a sentence in my textbook saying acid strength CANNOT be distinguished with indicators, but I think it can and that's where I got the idea from. How can I distinguish between acids of similar pKa then?
  8. Thanks. but actually I was thinking about chemistry...e.g. distinguish between weak and strong acids through titration using indicators.
  9. You said another suitable form of exploration is to compare different methods. Do I have to come up with a better method than the regular one taught in the text book? Is it okay if this new method is actually less efficient?
  10. Thank you very much! This is helpful with both my biology and chemistry IAs! One thing though, my biology teacher said he had a student who got a high score with simulations in genetics.
  11. Please please please can somebody help me???😭😭😭
  12. My teacher told me the biology ia has to involve the variables. i.e. the investigation must be about the effect of sth on sth. That doesn't sound right to me. Isn't it supposed to be an exploration related to ANYTHING we've covered in the course? I want to do an identification of lactobacilli in yogurt by DNA profiling. Is it possible that my teacher is mistaken? What about other restrictions on the choice of topic? DNA profiling tech is unavailable in my school lab. Is it ok to use more advanced equipment in outside labs? Or would it be considered beyond our level or even academically dishonest? Or, does it have to be a lab experiment at all? I heard about someone doing polygenic traits with computer simulations. Is that also acceptable? Could it be disadvantaged compared with a lab experiment and receive a lower score? P.S. How much time should I spend on my IA in all? I know the guide says 10 hrs but does it take longer in practice if I'm looking to achieve higher scores?
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