1. Titration Agenda Check molarity worksheet Notes on titration Partners work on titrations.

2. 1. A sample of 0.0341 mol iron(III) chloride was dissolved in water to give 25.0mL of solution. What is the molarity of the solution? 0.0341 mol FeCl 3 = 1.36 M FeCl 3 0.025 L

3. 2. An aqueous solution is made from 0.798g of potassium permanganate, KMnO 4. If the volume of solution is 50.0mL, what is the molarity of KMnO 4 in the solution? 0.798 g KMnO 4 |1 mol KMnO 4 | | 158.04 g KMnO 4 |0.0500 L =0.100 M KMnO 4

4. 3. What volume of 0.120 M CuSO 4 is required to give 0.150 mol CuSO 4 ? 0.150 mol CuSO 4 |1 L CuSO 4 |0.120 M CuSO 4 =1.25 M CuSO 4

5. 4. An experiment calls for 0.0353 g of potassium hydroxide. How many milliliters of 0.0176M KOH are required? 0.0353 g KOH|1 mol KOH| 1 L KOH| 1000 mL |56.1 g KOH| 0.0176 Mol KOH|1 L = 35.8 mL

6. 5. Heme, obtained from red blood cells, binds oxygen, O 2. How many moles of heme are there in 25 mL of 0.0019M heme solution? 0.025 L heme|0.0019 Mol heme |1 L heme = 4.8*10 -5 mol heme

7. 6. How many grams of sodium dichromate should be added to a 50.0 mL volumetric flask to prepare 0.250 M Na 2 Cr 2 O 7 when the flask is filled to the mark with water? 0.05 L Na 2 Cr 2 O 7 |0.250 Mol Na 2 Cr 2 O 7 |261.97g Na 2 Cr 2 O 7 |1 L Na 2 Cr 2 O 7 | 1 mol Na 2 Cr 2 O 7 = 3.27 g

8. 7. If 56.7g of Na 2 CrO 4 is dissolved in 547 mL, what will be the molarity of this solution? 56.7 g Na 2 CrO 4 |1 mol Na 2 CrO 4 | |162 g Na 2 CrO 4 | 0.547 L = 0.640 M

9. 8. If 47.3g of NaCl are required for a reaction, how many milliliters of 4.2 M NaCl? 47.3 g NaCl|1 mol NaCl|1 L NaCl|1000 mL |58.44 g NaCl|4.2 Mol NaCl|1 L =193 mL NaCl

10. 9. How many grams of CaCl 2 must be dissolved in water in order to create 751 mL of 4.2 M CaCl 2 ? 0.751 L CaCl 2 |4.2 Mol CaCl 2 |110.9 g CaCl 2 |1 L CaCl 2 |1 mol CaCl 2 =350. g CaCl 2

11. 10. You wish to prepare 1.00 L of 1.2M HNO 3 from a stock solution of nitric acid that is 15.8M. How many milliliter of stock solution do you require to the dilute solution? (1.2 M)(1.00 L) = (15.8 M)(V 2 ) V 2 = 76 mL

12. 11. You wish to prepare 150 mL of 4.5 M HNO 3 from a stock solution of nitric acid. How many milliliters of 15M HNO 3 are necessary? (4.5 M)(150 mL) = (15 M)(V 2 ) V 2 = 45 mL

13. 12. You wish to prepare 150 mL of 3.0 M H 2 SO 4 from a stock solution of sulfuric acid. How many milliliters of 12 M H 2 SO 4 are necessary to create the solution? (3.0 M)(150 mL) = (12 M)(V 2 ) V 2 = 38 mL

14. 13. You wish to prepare 25.0 mL of 5.0 M H 2 SO 4 from a stock solution of sulfuric acid that is 18M. How many milliliters of stock solution are needed? (5.0 M)(25.0 mL) = (18 M)(V 2 ) V 2 = 6.9 mL

15. 14. You wish to prepare 25 mL of 1.5 M HC 2 H 3 O 2 from a stock solution of acetic acid. How many milliliters of 12M HC 2 H 3 O 2 are necessary? (1.5 M)(25 mL) = (12 M)(V 2 ) V 2 = 3.1 mL

16. 15. You wish to prepare 655 mL of 0.50 M NaOH. How many milliliters of 6.0M NaOH need to be diluted to create this solution? (0.5 M)(655 mL) = (6.0 M)(V 2 ) V 2 = 55 mL

17. Titration January 10, 2008

18. Definition A procedure for determining the amount of substance A by adding a carefully measured volume of a solution with known concentration of B until the reaction of A and B is just complete. Sometimes called volumetric analysis

19. What is it? Titration is putting molarity and stoichiometry together. Our titrations will primarily deal with acids and bases. What do you know about acids and bases?

20. Acids and Bases Song Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

21. Now the first thing you gotta get straight in your head, Acids turn blue litmus paper to red. They react with metals with awesome power, They neutralize bases and taste very sour. Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

22. Bases are different from acids, it’s true, Bases turn litmus paper to blue. They neutralize acids, fell slippery on skin, they taste sorta bitter, and are called alkaline. Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

23. Well, there’s even more to this wonderful tale, Something we call a pH scale. It numbers from zero up to fourteen, Those are powers of then, if you know what I mean. Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

24. When the pH is 7, then it’s a case, Where the sample is neither acid nor base. But less then 7?...it’s an acid we say, More then 7?...it’s a base all the way. Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

25. Acids and bases?...now why should you care? ‘Cause acids and bases are everywhere. You put them on salads, and they get in the rain, They settle your tummy, and clean out your drain Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

26. So the next time you’re sitting under some shade, And you’re sipping a glass full of real lemonade, You’ll notice the sour taste and think in your head, I bet it turns blue litmus paper to red. Chorus: Acids and bases have two different faces, Two different personalities, And you gotta find out what they’re all about, If you want to learn chemistry.

27. Acids Start with H Taste sour Turn litmus paper red pH 0 – 7

28. Bases Contain OH Taste bitter Turn litmus paper blue pH 7 – 14

29. Acid-Base Indicators A dye used to distinguish between acidic and basic solutions by means of the color changes it undergoes in these solutions.