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In the natural sciences, and particularly in chemistry, generalities must come after the detailed knowledge of each fact and not before it.

Joseph Louis Gay-Lussac (1778 - 1850
Joseph Louis Gay-Lussac (1778 - 1850
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"Honestly speaking, this website is a "life-saver". It is one of the most useful and practical websites I have ever used for Chemistry. Huge thank you to your effort in putting together so many small pieces to produce such a holistic and great resource..."

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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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