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Acids Lesson 16 Titrations

This lesson focuses on primary and secondary standards in titrations. A primary standard is made using a pure solid, while a secondary standard requires a titration to calibrate its concentration. Various acids and bases are discussed, with examples of suitable and unsuitable substances provided.

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Acids Lesson 16 Titrations

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  1. Acids Lesson 16 Titrations

  2. A standard solutionhas known molarity. A primary standardis made by weighing a pure solidand diluting in a volumetric flask. A secondary standardrequires a titration to calibrate its concentration. It was made using an acid or base with suspect purity. Not suitable Example Reason Arrhenius basesNaOH Hydroscopic Strong acids HCl volatile liquids or gases Suitable solid bronsted bases Na2CO3 pure solid solid weak acids H2C2O4 pure solid

  3. Primary Standard Secondary Standard NaOH(s) Na2CO3(s) H2SO4(l) H2C2O4(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  4. Primary Standard Secondary Standard NaOH(s) Na2CO3(s) H2SO4(l) H2C2O4(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  5. Primary Standard Secondary Standard H2SO4(l) NaOH(s) Na2CO3(s) H2C2O4(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  6. Primary Standard Secondary Standard H2SO4(l) NaOH(s) Na2CO3(s) H2C2O4(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  7. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NaOH(s) Na2CO3(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  8. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NaOH(s) Na2CO3(s) HCl(g) KC6H5COO(s) C6H5COOH(s) NH3(g)

  9. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) NaOH(s) Na2CO3(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  10. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) NaOH(s) Na2CO3(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  11. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  12. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  13. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  14. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  15. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  16. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) NaOH(s) HCl(g) KC6H5COO(s) C6H5COOH(s)

  17. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) C6H5COOH(s) NaOH(s) HCl(g) KC6H5COO(s)

  18. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) C6H5COOH(s) NaOH(s) HCl(g) KC6H5COO(s)

  19. Primary Standard Secondary Standard H2SO4(l) H2C2O4(s) NH3(g) Na2CO3(s) C6H5COOH(s) NaOH(s) KC6H5COO(s) HCl(g)

  20. Preparing a Primary Standard 1. Calculate the mass of H2C2O4.2H2O require to prepare 100.0 mL of 0.1000 M standard solution. 0.1000 L

  21. Preparing a Primary Standard 1. Calculate the mass of H2C2O4.2H2Orequire to prepare 100.0 mL of 0.100 M standard solution. 0.1000 L x 0.1000 mole 1 L

  22. Preparing a Primary Standard 1. Calculate the mass of H2C2O4.2H2O require to prepare 100.0 mL of 0.100 M standard solution. 0.1000 L x 0.1000 mole x 126.06 g 1 L 1 mole

  23. Preparing a Primary Standard 1. Calculate the mass of H2C2O4.2H2O require to prepare 100.0 mL of 0.100 M standard solution. 0.1000 L x 0.1000 mole x 126.06 g = 1.261 g 1 L 1 mole

  24. Titration Calculation 2. 6.50 mL of 0.100 M H2C2O4 is required to neutralize 10.0 mL of NaOH solution in a titration. Calculate the base concentration. 1H2C2O4 + 2NaOH Na2C2O4 + 2H2O 0.00650 L 0.0100 L 0.100 M ? M 0.00650 L H2C2O4 x 0.100 mole 1 L x 2mole NaOH 1 mole H2C2O4 [NaOH] = 0.0100 L = 0.130 M

  25. Finish and hand in your report. Check your sig figs- should be 3. Make sure your work is perfect. Does all of your data have units? Make sure your unknown letter is recorded. Put away 10 pieces of glassware from the side of the room!

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