By: Chun Yi Ma and Sami Abdelkhaliq

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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:

By: Chun Yi Ma and Sami Abdelkhaliq 18.4 Acid-base Titrations By: Chun Yi Ma and Sami Abdelkhaliq

18.4.1 Sketch the general shapes of graphs of pH against volume for titrations involving strong and weak acids and bases, and explain their important features.

Strong Base and Strong Acid Titration 25 cm3 of 0.1 M HCl titrated by 0.1 M NaOH 25 cm3 of 0.1 M NaOH titrated by 0.1 M HCl

Important Features Equivalence point ≠ pH 7 Equivalence Point: the point where there are exactly the same number of moles of acid and base. Equivalence point ≠ pH 7 Buffer region: the region where there is little change to the pH in the solution that is being titrated pKa = pH or pKb = pOH happens in the middle of the buffer region.

Weak Acid Titrated by Strong Base

Weak Base and Weak Acid 25 cm3 of 0.1 M CH3COH2 titrated by 0.1 M NaOH 25 cm3 of 0.1 M NH3 titrated by 0.1 M HCl

Strong Base and Strong Acid Titration

Weak Acid Titrated by a Strong Base

Weak Base Titrated by a Strong Acid

Features of Equivalence Points Strong base and strong acid titration Equivalence point = 7 Weak acid titrated by a strong base Equivalence point > 7 Weak base titrated by a strong acid Equivalence point < 7

What Can Be Deduced From This Graph? Equivalence Point Volume of acid added (cm3)