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As the solo chemistry teacher at an international school, introducing the IB, this site literally "saved my skin" -never felt alone and a wonderful resource. Highly recommended

Robert Nolan, Internationale Friedensschule Köln, Germany

This is an excellent resource for IB chemistry teachers, it is easy to use and navigate your way through.

Sarah Al-Benna, Heidelberg International School, Germany

The InThinking Chemistry website by Geoffrey Neuss is a valuable resource. The presentations are useful and supplement my course textbook by giving students tasks throughout to check their understanding. The topic introductions provide points of interest...

Nick Pinkerton, Tamagawa Academy K-12 & University, Japan

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Sales of Zantac® suspended

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


  • 13 Nov Geoffrey Neuss
    Redox titration with KMnO4
    Sonja, I would think that a comparison of some different methods of determining iron content has a lot more potential than just finding out the amount of iron in a particular brand of tablet. In the above experiment ammonium iron(II) sulfate...
  • 13 Nov Sonja De Beer
    Redox titration with KMnO4
    Hi Geoffry, thanks for the help. Yes, I am aware that it is not the HCl that oxidizes Fe, was just wondering how/if the presence of the acid in the stomach would influence the process. Basically I have a student who wants to determine amount...
  • 13 Nov Geoffrey Neuss
    Redox titration with KMnO4
    Hi Sonja, Yes, it can matter which acid you use. MnO4− is a strong oxidising agent and if you look at the table of electrode potentials in section 24 of the data booklet you will see that it can oxidize chloride ions as well as Fe2+ ions....
  • Thank you Geff , but i have asked the question since i have answered Q4 and the molar ratio if i got one digit after decimal point it will be 2.3 :2 :1 thus the empirical formula will be C7H6O3 while your molar ratio (took two digits after...
  • 13 Nov Sonja De Beer
    Redox titration with KMnO4
    HI Geoffrey, Does the type and concentration of the acid used matter? Can HCl at different concentrations be used to simulate conditions in stomach and determine optimum pH/ concentration for Fe2+ to be changed to Fe 3+ in stomach? Thanks...
  • 13 Nov Geoffrey Neuss
    SL Practice Paper 1 (1)
    Hi Piotr, It is interesting how multiple choice questions can often throw up nuances of language which can even be difficult for native speakers let alone non-native speakers. Suppose someone earns 48000 US dollars a year. If I ask them how...
  • 12 Nov Piotr Koczoń
    SL Practice Paper 1 (1)
    Hello Geoffrey, I think I can not agree with your clarification. If g x mol-1 are used the mention about molar mass must be given. If best answer is to be selected I would select the one without units rather although there is no mention about...
  • 12 Nov Geoffrey Neuss
    Unit plans
    Hi Susan, I encourage teachers to make their own unit plans as they know best their own timetable, resources, local issues, students etc. etc.
  • 12 Nov Susan Ong
    Unit plans
    Hi Dr Neuss Can I ask for your kind help If you can share your unit planners for the entire ib chemistry course here? If not do you have any idea where I can get hold of these planners as we are required to craft them. Thanks in advance.
  • 12 Nov Geoffrey Neuss
    Grade boundaries
    Hi Weweje, I can update them to the May 2019 boundaries if you like but there is no real point. I keep saying they are not fixed - it depends upon the paper. i.e. they are criteria based not norm referenced. If you really want them they are...
  • 12 Nov Weweje Weweje
    Grade boundaries
    When will you update these boundaries? Any reason for the dramatic increase in the boundaries for 2019?
  • 12 Nov Geoffrey Neuss
    Basic information
    Hi Calvin, The best international chemistry competition for IBDP students is the Chemistry Olympiad. Most countries run their own and then submit the best students to the international competition to compete against other countries. This year...

Resources


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.

more info