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  • Paul

    Site author
    1 Oct 2026

    Me too! As far as I know, there are no other issues with sodium hydroxide in the burette. My students frequently do it that way round. We just make sure that we don't leave the sodium hydroxide in the burette, and we rinse it out afterwards. The etching...

    Acid-alkali titration

  • 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

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