University College - Chemistry Chem 112A Lecture Notes - Lecture 11: Amphoterism, Weak Base, Acid Strength
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13 Feb 2017
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Shows the change in ph when a small amount of titrant causes a big change in ph. Weak acid + weak base, where both have intense but different colors. Kin = [h3o+][in-]/[hin] ph = pkin log[hin]/[in-] if [hin] >> [in-] -> color 1 dominates, ph < pkin if [hin] << [in-] -> color 2 dominates, ph > pkin. X = 1. 87x10-3 = [h3o+] ph = 2. 73. So the system pushes right until all the acetic acid is consumed. As oh- is added, more oac- and h3o+ is produced. Effectively, hoac + naoh -> naoac + h2o. Noh = 0. 02 mol added at equivalence point. Vnaoh = 0. 02 mol * 1/[oh-] = 0. 02/. 1. = . 2l = 200ml ph at equivalence point based on a naoac solution. [oac-] = noac/v = 0. 02/(. 1 +. 2) = . 02/. 3 = . 067m. X = 6. 17 x 10-6 ph = 14 poh = 8. 79.
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