Chapter+10+Acid-Base+Titrations+Skeleton+Notes - Chapter 10...

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Chapter 10: Acid-Base Titrations I. Steps in solving a titration problem. A. Calculate the volume of titrant required to reach the equivalence point. B. Identify where you are in the titration (equivalence point, beyond the equivalence point, before the equivalence point). C. Write out the chemical reaction (weak acid equilibrium, weak base equilibrium, titration reaction) for the given region. D. Solve the problem. II. What happens throughout a titration of a weak acid (HA) with a strong base (OH - )? A. Region 1 (V OH- added = 0 mL): Have a Weak Acid (HA). Weak Acid Equilibrium: HA + H 2 O A - + H 3 O + [HA] ] H ][ [A = K + - a F – x + x + x x - F x = K OR F K = ] [H a 2 a a a approx + B. Region 2: Buffer Region (HA and A - ) pH V OH - (mL) Region 1 Region 2 Region 3 Region 4
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V 0 mL < V OH- added < V eq Titration Reaction: HA + OH - A - + H 2 O K = 1/K b [HA] ] [A Log pK pH a - + = C. Region 3: Equivalence Point; Have a Weak Base (A - ) . moles of Analyte (HA) = moles of Titrant (OH
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Chapter+10+Acid-Base+Titrations+Skeleton+Notes - Chapter 10...

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