exp16_prelab

exp16_prelab - Experiment 15: Identification of an Unknown...

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Experiment 15: Identification of an Unknown Acid The Last Lab!!!!
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Learning Objectives You are assigned an unknown acid Use titration analysis to identify the acids from the following information Initial pH Half-equivalence points (pK a ’s) Molecular weight
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Monoprotic Acids Molecules with only 1 hydrogen available for dissociation Common monoprotic acids: HCl, HNO 3 , CH 3 COOH (acetic acid = vinegar) Cl - HCl H + +
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Polyprotic Acids Have more than 1 dissociable hydrogen Common polyprotic acids: amino acids, H 2 CO 3 , H 2 SO 4 , H 3 PO 4 Have 3 forms: acid, zwitterion, and base Form of acid, i.e. degree of dissociation, depends on pH of solution
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Examples of Polyprotic Acids Acid form @ Low pH Zwitterion @ Moderate pH Basic form @ High pH O H OH O O H O O - O O O - - H 2 CO 3 CO 3 2- HCO 3 -
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Acid Dissociation Constants, K a Describes the equilibrium between a weak acid and its conjugate base If an acid is diprotic there will be two K a ’s If an acid is triprotic there will be three K
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exp16_prelab - Experiment 15: Identification of an Unknown...

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