ch9 acid base - Click to edit Master subtitle style Chapter...

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Unformatted text preview: Click to edit Master subtitle style Chapter 9 Principles of Neutralization Titrations Strong Acids and Bases A strong acid or base is completely dissociated in aqueous solution. Weak Acids and Bases A weak acid is one that is only partially dissociated in water. This definition means that K a is small for a weak acid. Polyprotic acids and bases Compounds that can donate or accept more than one proton The standard notation for successive acid dissociation constants of a polyprotic acid is K 1, K 2, K 3, and so on The Nature of H+ and OH In the gas phase, H3O+ can be tightly surrounded by 20 molecules of H2O in a regular dodecahedron held together by 30 hydrogen bonds. Small dark and white atoms are H. Dark H atoms are hydrogen bonded. Autoprotolysis What is the concentration of OH if [H+] = 1.0 103 M? Pure Water To remove impurities, you have to distill the water 42 consecutive times under vacuum to reduce conductivity to a limiting value!!!! Relation Between Ka and Kb Exercise Calculate the pH of 5.0 108 M HClO4. What fraction of the total H+ in this solution is derived from dissociation of water. Exercise What is the pH of a solution prepared by dissolving 1.23 g of 2-nitrophenol (FM 139.11) in 0.250 L? Exercise The pH of 0.10 M ethylamine is 11.82.Without referring to Appendix G, find K b for ethylamine. Exercise Find the pH of a solution prepared by dissolving 1.00 g of glycine amide hydrochloride (Table 9-2) plus 1.00 g of glycine amide in 0.100 L. (b) How many grams of glycine amide should be added to 1.00 g of glycine amide hydrochloride to give 100 mL of solution with pH 8.00? (c) What would be the pH if the solution in part (a) were mixed with 5.00 mL of 0.100 M HCl? (d) What would be the pH if the solution in part (c) were mixed with 10.00 mL of 0.100 M NaOH? (e) What would be the pH if the solution in part (a) were mixed with 90.46 mL of 0.100 M NaOH? (This is exactly Exercise Find the pH and the concentrations of H2SO3, , and in each solution: (a) 0.050 M H2SO3; (b) 0.050 M NaHSO3; (c) 0.050 M Na2SO3. Exercise Calculate the pH of a 0.010 M solution of each amino acid in the form drawn here. Titration of Strong Acid and Strong Base How does the pH change as titrant is added? Titration Curve EXAMPLE: Describe the preparation of 2.000 L of 0.1000 M KHP (potassium hydrogen phthalate) solution (f.w. 204.23) from primary standard solid. EXAMPLE: What is the molarity of a NaOH solution EXAMPLE: What is the molarity of an HCl solution if it O bj1 0...
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ch9 acid base - Click to edit Master subtitle style Chapter...

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