CHEM 1120 Edition 1nd Lecture 16 Outline of Last Lecture I Buffers continued a Selecting an acid base pair b Buffer range and capacity II Acid Base Titrations a Equivalence point b Endpoint c Calculations d What variables affect a titration curve Outline of Current Lecture I Titrations a Variables that determine features of a titration curve b Weak acid strong base titration curve c Diprotic Acids d Acid base indicators Current Lecture I Titrations a What variables determine the features of a titration curve i Acid concentrations ii Acid strength Ka iii Number of protons iv Base concentration v Base strength Kb vi Number of hydroxides vii Analyte acid or base viii Volume of analyte b A weak acid strong base titration curve i For calculations divide the curve into 4 regions like before 1 Before titrant is added treat as weak acid problem ICE table 2 Before equivalence point use Henderson Hasselbalch equation 3 At equivalence point treat as neutralization then weak base problem ICE table 4 After equivalence point treat as limiting reagent problem SB pH These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute ii Why does pKa pH at half the equivalence point volume 1 At half the equivalence point volume half the HOAc has reacted to form OAc and half remains unreacted c Diprotic acids equivalence point for each dissociation i Diprotic 2 points d Acid base indicators a weak acid or weak base whose color differs in acidic and basic solutions i
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