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The Role of the Librarian
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Virtual (IB Approved), 25 - 27 September 2026

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"Hi fellow chemistry teachers. I am leaving IB this year but ABSOLUTELY recommend that you lobby your coordinators and administrators to get access to this site. It is something I wish i had done/been aware of and done YEARS ago. Geoff makes things easily..."

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Greengate School

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  • Harprit

    22 Sep 2026

    Thanks for the suggestion. I've considered comparing two approaches for other experiments but hadn't for kinetics.

    Internal Assessment

  • Paul

    Site author
    22 Sep 2026

    You raise a very good point, Austin. This question relies on an oversimplification of the model ('Weak acids have strong conjugate bases" is not correct; I like your correction). We've simplified the model to help with understanding, but in this case,...

    MC test: R3.1 (AHL) pOH, Ka, Kb, pKa and pKb

  • Susan

    22 Sep 2026

    Hi I am very surprised to see the following answers in the May 2026 P2 TZ1 answer that in 3(c)(ii), the IB does not accept probability of collision on effect of increase temp on rate. However in the IB guide, it is clearly written...

    R2.2 Rate of reaction & collision theory

  • Austin

    22 Sep 2026

    Most of my students chose option D for question 6, and I think it is probably the most appropriate answer following the IB guidance of choosing the "best" option.  However, I'm wondering if there is potential for confusion amongst more careful...

    MC test: R3.1 (AHL) pOH, Ka, Kb, pKa and pKb

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