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Acids Lesson 20 Titration Curves.

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Presentation on theme: "Acids Lesson 20 Titration Curves."— Presentation transcript:

1 Acids Lesson 20 Titration Curves

2 Titration Curves  A titration curve is a graph of the pH changes that occur during an acid-base titration versus the volume of acid or base added. There are three types of titration curves. You need to be able to recognize each and then choose a suitable indicator for that titration. The equivalence point is the end of a titration where the stoichiometry of the reaction is exactly satisfied, or moles H+ = moles OH-. The transition point refers to when an indicator changes color and [HInd] = [Ind-].

3 Choosing an Indicator When you choose an indicator, you must pick one so that the transition point of the indicator matches the equivalence point of the titration. When acid base titration is at the equivalence point, the acid has neutralized the base leaving only a salt and water. The pH of the equivalence point depends on type of salt. Rule of thumb If the salt is neutral the equivalence point = 7 If the salt is basic the equivalence point = 9 If the salt is acidic the equivalence point = 5

4 1. Titration Curve: Strong Acid and Strong Base
HCl KOH →

5 1. Titration Curve: Strong Acid and Strong Base
HCl KOH → KCl HOH

6 1. Titration Curve: Strong Acid and Strong Base
HCl KOH → KCl HOH Indicator

7 1. Titration Curve: Strong Acid and Strong Base
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue

8 1. Titration Curve: Strong Acid and Strong Base
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl

9 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 25 50

10 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 0.10 M HCl 25 50

11 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 0.10 M HCl Neutral Salt 25 50

12 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 0.10 M KOH 0.10 M HCl Neutral Salt 25 50

13 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 25 50

14 1. Titration Curve: Strong Acid and Strong Base HCl + KOH → KCl + HOH
HCl KOH → KCl HOH Indicator pH = 7 Bromothymol Blue 50 mL of 0.10 M KOH is added to 25 mL of 0.10 M HCl pH Volume .10 M KOH added 14 7 25 50

15 2. Titration Curve: Weak Acid and Strong Base
HCN KOH →

16 2. Titration Curve: Weak Acid and Strong Base
HCN KOH → KCN HOH

17 2. Titration Curve: Weak Acid and Strong Base
HCN KOH → KCN HOH Indicator

18 2. Titration Curve: Weak Acid and Strong Base
HCN KOH → KCN HOH Indicator pH = 9 Phenolphthalein

19 2. Titration Curve: Weak Acid and Strong Base
HCN KOH → KCN HOH Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH

20 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 10 20

21 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 1.0 M KOH 10 20

22 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 1.0 M KOH Basic Salt 10 20

23 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 1.0 M KOH Basic Salt 1.0 M HCN 10 20

24 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 1.0 M KOH Basic Salt 1.0 M HCN 10 20

25 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH pH Volume 1.0 M HCN added 14 7 10 20

26 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH Buffer Zone pH Volume 1.0 M HCN added 14 7 10 20

27 2. Titration Curve: Weak Acid and Strong Base HCN + KOH → KCN + HOH
Indicator pH = 9 Phenolphthalein 20 mL of 1.0 M HCN is added to 10 mL of 1.0 M KOH Buffer Zone Weak Acid & Salt are present pH Volume 1.0 M HCN added 14 7 10 20

28 3. Titration Curve: Strong Acid and Weak Base
HCl NH3 →

29 3. Titration Curve: Strong Acid and Weak Base
HCl NH3 → NH4+ + Cl-

30 3. Titration Curve: Strong Acid and Weak Base
HCl NH3 → NH4+ + Cl- Indicator

31 3. Titration Curve: Strong Acid and Weak Base
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red

32 3. Titration Curve: Strong Acid and Weak Base
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl

33 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 30 60

34 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 1.0 M HCl 30 60

35 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 1.0 M HCl Acid Salt 30 60

36 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 1.0 M NH3 1.0 M HCl Acid Salt 30 60

37 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 30 60 1.0 M NH3 1.0 M HCl Acid Salt

38 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 30 60

39 3. Titration Curve: Strong Acid and Weak Base HCl + NH3 → NH4+ + Cl-
HCl NH3 → NH4+ + Cl- Indicator pH = 5 Methyl Red 60 mL of 1.0 M NH3 is added to 30 mL of 1.0 M HCl pH Volume 1.0 M NH3 added 14 7 Buffer Zone Weak Base & Salt are present 30 60

40 4. Match the Curve with the Reaction
pH Volume .10 M KOH added 14 7 25 50 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

41 4. Match the Curve with the Reaction
pH Volume .10 M KOH added 14 7 25 50 Bisect the verticle pH = 7 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

42 4. Match the Curve with the Reaction
pH Volume .10 M KOH added 14 7 25 50 Bisect the verticle pH = 7 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

43 5. Match the Curve with the Reaction
pH Volume 1.0 M NH3 added 14 7 30 60 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

44 5. Match the Curve with the Reaction
pH Volume 1.0 M NH3 added 14 7 Bisect the verticle pH = 5 30 60 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

45 6. Match the Curve with the Reaction
pH Volume 1.0 M NH3 added 14 7 30 60 A. 3HCl Al(OH)3 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

46 6. Match the Curve with the Reaction
pH Volume 1.0 M NH3 added 14 7 Bisect the verticle pH = 9 30 60 A. 3HCl Al(OH)2 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

47 6. Match the Curve with the Reaction
pH Volume 1.0 M NH3 added 14 7 Bisect the verticle pH = 9 30 60 A. 3HCl Al(OH)2 → AlCl HOH B. HCl KOH → KCl HOH C. HCN KOH → KCN HOH

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