CHEM 1120 1nd Edition Lecture 16Outline of Last Lecture I. Buffers continueda. Selecting an acid/base pairb. Buffer range and capacityII. Acid – Base Titrationsa. Equivalence pointb. Endpointc. Calculationsd. What variables affect a titration curve?Outline of Current Lecture I. Titrationsa. Variables that determine features of a titration curveb. Weak acid-strong base titration curvec. Diprotic Acidsd. Acid-base indicatorsCurrent LectureI. Titrationsa. What variables determine the features of a titration curve?i. Acid concentrationsii. Acid strength (Ka)iii. Number of protons iv. Base concentrationv. Base strength (Kb)vi. Number of hydroxidesvii. Analyte = acid or baseviii. Volume of analyte!b. A weak acid-strong base titration curvei. For calculations: divide the curve into 4 regions like before1. Before titrant is added: treat as weak acid problem-ICE table2. Before equivalence point: use Henderson-Hasselbalch equation3. At equivalence point: treat as neutralization, then weak base problem-ICE table4. After equivalence point: treat as limiting reagent problem, SB pHThese 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 volume1. At half the equivalence point volume, half the HOAc has reacted to form OAc-, and half remains unreactedc. Diprotic acids: equivalence point for each dissociationi. Diprotic=2 pointsd. Acid base indicators: a weak acid or weak base whose color differs in acidic and basic
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