Exp16_Prelab

Exp16_Prelab - The Last Lab You are assigned an unknown...

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Unformatted text preview: The Last Lab!!!! You are assigned an unknown acid Use titration analysis to identify the acids from the following information ◦ Initial pH ◦ Half-equivalence points (pKa’s) ◦ Molecular weight Molecules with only 1 hydrogen available for dissociation Common monoprotic acids: HCl, HNO 3 , CH 3 COOH (acetic acid = vinegar) 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 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 a ’s Example: Glycine The half-equivalence point is halfway between two equivalence points At the half-equivalence point [acid]=[base] and the solution is a buffer solution The Henderson-Hasselbach equation is useful when working with buffers...
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This note was uploaded on 02/06/2010 for the course CHEM 102L taught by Professor N/a during the Spring '07 term at UNC.

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Exp16_Prelab - The Last Lab You are assigned an unknown...

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