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ID: past-exam-of-the-chemistry-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2021/paper-1/5/b/i/solution

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Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2021 / Paper 1 / 5 / b / i / Solution by

Codex  0 2026-10-20

2 5^{\circ} C

[O H^{-}] = 1 0^{pH - 14} mol d m^{- 3}

in the usual dilute-solution thermodynamic activity approximation. Therefore A: $1 0^{- 2} M$ ; B: $1 0^{- 4} M$ ; C: $1 0^{- 4} M$ . These are initial concentrations; only C is actively buffered at its stated value.

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