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- 2011 · A t = 0 4,5 1,5 1 (mo ℓ) A t f’ 4,5 - 2xf’ 1,5 - x f ... pKa = 2.pH 1 + ℓog C 1 soit pKa = 3,8 ... on agite la solution pour la rendre homogène . c) pH 2 = 2 ...
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