Year 13 · AQA + OCR A
Acids, buffers and indicators
Practise the chemistry around the calculation: which species remain after neutralisation, how a buffer removes added acid or alkali, which equation to use, and whether an indicator range fits the pH curve.
Acid–base reasoning set
Choose an answer, then use the feedback to pin down the species, equilibrium or pH-curve feature that matters.
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Acids and buffers0 parts marked
Do the chemistry before the logarithm
When acid and base have reacted, stop and list what is left before choosing Ka, Kw or a strong-acid/base calculation.