Titration Curve (Weak Base + Strong Acid)

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Outline:3/9/07 è Chem. Dept. Seminar 4pm è 3 more lectures until Exam 2… è Chemistry Advising – 4pm Today: è More Chapter 18 Titrations.

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Presentation transcript:

Unit 6: Acid-Base Applications Lesson 5: Titration of a Weak Base with a Strong Acid

Titration Curve (Weak Base + Strong Acid) Like the curve for a strong base and a weak acid, but upside down! pH < 7 at eq point. 10 min

Choosing an Indicator Weak Base + Strong Acid → Acidic Salt E.g. NH3 + HCl → NH4+ + Cl- Thus the eq point is acidic. The weaker the base, the stronger its conjugate acid, and the lower the pH of the equivalence point! In general, choose an indicator with pKa = 4-6 10 min

Brain Break! Find as many words as you can using the letters shown, always using the middle letter. What’s the 9-letter word? translate

Finding [Base] without [Acid] Step 1: pKb = pOH1/2 Step 2: [A-]eq = [OH-]init2 / Kb Step 3: [A-]init = [A-]eq + [OH-]init Example: A 25.00 mL sample of ethylamine (a weak base) is titrated with 19.22 mL of HCl. The initial pH of the ethylamine sample is 11.855, and the pH after 9.60 mL of HCl has been added is 10.807. Find the initial concentration of ethylamine. 20 min

Practice: Pg. 176 #125, 127, and 130 15 min