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A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.

Max Karl Ernst Ludwig Planck (1858 - 1947)
Max Karl Ernst Ludwig Planck (1858 - 1947)
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"This is an outstanding and excellent resource. I found it very useful for me and my students. The website covers all the needed details for the teachers and the students."

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Modern American School of Egypt

"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..."

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Tamagawa Academy K-12 & University

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  • Austin

    30 Sep 2026

    In general, I find it easier to identify the colourless to pink colour change rather than pink to colourless.  Is there any major issue with switching the acid and base other than that the sodium hydroxide may cause etching or other damage to...

    Acid-alkali titration

  • Paul

    Site author
    30 Sep 2026

    Hi John Yes, that's correct.And I can confirm that the guide, Reactivity 3.2.2, says: Deduce redox half-equations and equations in acidic or neutral solutions. I believe candidates might be asked to balance a...

    R3.2 Oxidation & reduction

  • John

    30 Sep 2026

    HI,  On this, can I confirm that in neutral conditions, they should write half equations using H+/H2O and that they do not need to use H2O/OH- at all when creating half equations (as basic conditions are not part of spec)? Thanks, John

    R3.2 Oxidation & reduction

  • Susan

    28 Sep 2026

    Thanks for your advice. I have put up a case on IB Answers

    R2.2 Rate of reaction & collision theory

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