General Chemistry - Weak Acid-Strong Base Titrations | 17.3b General Chemistry

Chad provides a thorough lesson on how to perform pH calculations for Weak Acid-Strong Base Titrations. Reactions between weak acids and strong bases effectively go to completion, and therefore the reaction between them can be treated as a limiting reagent calculation. Before the addition of strong base (the initial point on the titration curve) there is only weak acid in the solution and calculating the pH of a weak acid was presented in chapter 16. Before the equivalence point in a weak acid-strong base titration the addition of strong base has neutralized some but not all of the weak acid converting it into its conjugate base. Having both weak acid and conjugate base in the solution, the pH can be calculated using the Henderson-Hasselbalch equation. At the equivalence point in a weak acid-strong base titration, effectively all of the weak acid has been converted into its conjugate base (which is a weak base), and calculating the pH of a weak base was presented in chapter 16. The tricky part is that one will typically have to determine the value of Kb from the relation: KaKb = Kw. Finally, after the equivalence point in a weak acid-strong base titration there will be excess strong base remaining in the solution along with the production of the conjugate base. For practical purposes, the contribution of the weak base is ignored, and the pH of the solution is calculated as if it were simply the pH of a strong base solution. The lesson is concluded by explaining weak base-strong acid titration curves and showing how weak base-strong acid pH calculations are analogous to weak acid-strong base pH calculations. I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at https://www.chadsprep.com/chads-general-chemistry-videos/titration-calculations/ If you want all my study guides, quizzes, final exam reviews, and practice exams, check out my General Chemistry Master Course at https://www.chadsprep.com/genchem-youtube 00:00 Lesson Introduction 00:30 Weak Acid-Strong Base Titrations pH at Initial Point 04:25 Weak Acid-Strong Base Titrations pH Before Equivalence Pt 11:05 Weak Acid-Strong Base Titrations pH at Half-Equivalence Pt 14:47 Weak Acid-Strong Base Titrations pH at Equivalence Point 21:16 Weak Acid-Strong Base Titrations pH after Equivalence Pt 25:44 Weak Base-Strong Acid Titration Curve and pH Calculations https://www.chadsprep.com/ #generalchemistry #chemistrytutorial #titration