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One is almost tempted to say….at last I can almost see a bond. But that will never be, for a bond does not really exist at all: it is a most convenient fiction which , as we have seen, is convenient both to experimental and theoretical chemists.
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11 Sep 2026
The importance of using clear English in IB chemistry
Why using clear English is important when communicating in chemistry. This blog gives examples of two past IB questions where the language used to phrase the questions can lead to different interpretations...
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Subscriber comments
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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 -
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 -
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
Paul
Site authorMe 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