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Titration

Titration. Agenda Complete molarity worksheets with partner Notes on titration Demos. Partner time. Complete the molarity and dilution worksheets with a partner. Hopefully this will only take ~15 minutes.

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Titration

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  1. Titration Agenda • Complete molarity worksheets with partner • Notes on titration • Demos.

  2. Partner time • Complete the molarity and dilution worksheets with a partner. • Hopefully this will only take ~15 minutes

  3. 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 FeCl3 = 1.36 M FeCl3 0.025 L

  4. 2.      An aqueous solution is made from 0.798g of potassium permanganate, KMnO4. If the volume of solution is 50.0mL, what is the molarity of KMnO4 in the solution? 0.798 g KMnO4 | 1 mol KMnO4 | | 158.04 g KMnO4 | 0.0500 L = 0.100 M KMnO4

  5. 3.      What volume of 0.120 M CuSO4 is required to give 0.150 mol CuSO4? 0.150 mol CuSO4 | 1 L CuSO4 | 0.120 M CuSO4 = 1.25 M CuSO4

  6. 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

  7. 5.      Heme, obtained from red blood cells, binds oxygen, O2. 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

  8. 6.      How many grams of sodium dichromate should be added to a 50.0 mL volumetric flask to prepare 0.250 M Na2Cr2O7 when the flask is filled to the mark with water? 0.05 L Na2Cr2O7 |0.250 Mol Na2Cr2O7 |261.97g Na2Cr2O7 |1 L Na2Cr2O7 | 1 mol Na2Cr2O7 = 3.27 g

  9. 7. If 56.7g of Na2CrO4 is dissolved in 547 mL, what will be the molarity of this solution? 56.7 g Na2CrO4 | 1 mol Na2CrO4 | | 162 g Na2CrO4 | 0.547 L = 0.640 M

  10. 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

  11. 9. How many grams of CaCl2 must be dissolved in water in order to create 751 mL of 4.2 M CaCl2? 0.751 L CaCl2 |4.2 Mol CaCl2 |110.9 g CaCl2 |1 L CaCl2 |1 mol CaCl2 = 350. g CaCl2

  12. 10. You wish to prepare 1.00 L of 1.2M HNO3 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)(V2) V2 = 76 mL

  13. 11. You wish to prepare 150 mL of 4.5 M HNO3 from a stock solution of nitric acid. How many milliliters of 15M HNO3 are necessary? (4.5 M)(150 mL) = (15 M)(V2) V2 = 45 mL

  14. 12. You wish to prepare 150 mL of 3.0 M H2SO4 from a stock solution of sulfuric acid. How many milliliters of 12 M H2SO4 are necessary to create the solution? • (3.0 M)(150 mL) = (12 M)(V2) V2 = 38 mL

  15. 13. You wish to prepare 25.0 mL of 5.0 M H2SO4 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)(V2) V2 = 6.9 mL

  16. 14. You wish to prepare 25 mL of 1.5 M HC2H3O2 from a stock solution of acetic acid. How many milliliters of 12M HC2H3O2 are necessary? (1.5 M)(25 mL) = (12 M)(V2) V2 = 3.1 mL

  17. 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)(V2) V2 = 55 mL

  18. Titration January 10, 2008

  19. 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

  20. 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?

  21. Acids and Bases Song Acids and bases have two different faces, two different personalities. And you gotta find out what they’re all about, if you wanna learn chemistry.

  22. Now the first thing you gotta get straight in your head, acids turn blue litmus paper to red.

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

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

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

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