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Katie Woodcock, Sir James Henderson School, Italy

Easy, user friendly site that enables the teachers to easily access to a wealth of materials, questions, TOK, nature of science and exam uestions.

Robert Macbeth, Institut Montana Zugerberg, Switzerland

You are doing a wonderful job by helping IB teachers to have materials which helps them prepare their lessons, especially with the new syllabus for 2016 exams. I cherish the way each topic gives a presentation which helps the teacher to arouse the interest...

Chidiebere Obi Machabeng College, International School of Lesotho, Lesotho

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29 September 2019

Zantac is one of the most widely used H2 receptor blocker antacidsA few weeks ago I wrote about the dangers of taking PPIs long term, now it... more

The danger of prolonged use of proton pump inhibitors

5 July 2019

Students studying the medicinal chemistry option need to be able to explain the three main ways in which excess stomach acid can be controlled... more

Subscriber comments

  • 15 Oct Rachel Punter
    Analysis of aspirin tablets
    True that, but I will try it and see and let you know how we got on!
  • 15 Oct Geoffrey Neuss
    'Scaffolding' the investigation
    Hi Nanette, If your student searches online there are several articles which include details of how flavonoid concentration can be determined e.g. using GC/MS and UV-VIS spectrometry / etc. etc. Your student should be able to write a good...
  • 15 Oct Nanette Nicol
    'Scaffolding' the investigation
    Dear Geoff, my students are in the process of completing their IA's. One of my students is trying to determine the amount of flavonoids in green tea and is finding it very difficult to find an indicator that will work. Is there any she could...
  • Good questions
  • 14 Oct Anthi Kotsiliou
    Electrochemical cells questions
    Geoff, I certainly agree but conventions are often used and I would not like my students to be marked down for something like that. Thank you!
  • 14 Oct Geoffrey Neuss
    Rate-dependent factors
    Hi Hiba, This is one of the classic experiments and to be honest I've never experienced any problems in a well ventilated lab. The amount of sulfur dioxide evolved is so low that most of it probably dissolves in the solution rather than comes...
  • 14 Oct Hiba Bayoumi
    Rate-dependent factors
    Hello Geoffrey, I know the amout of SO2 produced is minimal, and you ask students not to inhale any, but I think it wont be possible not to, since they have to watch the mark. I am afraid this might be of a risk on their health especially...
  • 14 Oct Geoffrey Neuss
    Analysis of aspirin tablets
    Hi Rachel, Sodium carbonate is a weak base so you would be doing a weak acid-weak base titration so are unlikely to get a clear end point - but you could try it and see!
  • 14 Oct Rachel Punter
    Analysis of aspirin tablets
    Just a random lab question...could this titration work with sodium carbonate solution? Just wondering if they could use the standard solutions they made rather than standardising NaOH to save reosurces...Thanks!
  • 14 Oct Geoffrey Neuss
    MC test: Strong & weak acids & bases
    Hi Robert, Do you mean if the question (rather than the answer) was altered to be 1.0 mol dm-3 H2SO4? Technically you would then be correct as the concentration of ions would be less than 3 mol dm-3 (but more than 2 mol dm-3) as HSO4- is not...
  • Hi Geoff, in the explanation to the answer for the question about electrical conductivity it suggests that H2SO4 completely dissociates (for the first and second dissociation). Shouldn't the total ion concentration for 0.5M H2SO4 be less than...
  • 12 Oct Geoffrey Neuss
    MC test: Lewis acids & bases
    Anju, It is not that simple since orbitals can hybridize, e.g. d2sp3. This is obviously beyond the IB syllabus but if you search online for hydration of metal ions in solution you can find some interesting articles, e.g. and


Chemistry for the IB Diploma (Oxford IB)

The new edition of the Study Guide (which has sold over 150,000 copies) by Geoffrey Neuss for first exams in 2016.

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