C2HWsoln - CHM 3610 Summer 2005 HOMEWORK CHAPTER 2...

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CHM 3610 Summer 2005 HOMEWORK CHAPTER 2 Exercises 2, 3, 5, 7, 8, 15, 29, 37, 38, 44, 45, and 48. Q2. Part Element pK a Acidity Soln pH 4 Soln pH 11 (a) Heltonium 18.0 Non acidic Yes Yes (b) Azharium 18.0 Very strongly No No (c) Lawhornium 8.0 Weakly Yes No (d) Oyegbium 3.0 Strongly No No (e) Robertsium 3.0 Moderately No No Q3. (a) pK a = 12.5 Feebly acidic (b) pK a = 3.0 Moderately acidic (c) pK a > 16. Nonacidic (d) pK a < -4 Very strongly acidic Q5. (a) Pb 4+ pK a = 7.4 Very strongly acidic Pb 2+ pK a = 7.7 Weakly acidic Yb 2+ pK a = 12.1 Feebly acidic (b) Pb 4+ Third Pb 2+ Second Yb 2+ First (c) Pb 4+ does not exist in solution Q7. Charge, radius, and electronegativity of the ion influence the acidity. The higher the charge on the ion the greater is the attraction for the electrons on the water molecule which increases the positive character of the H atom and the acidity. The smaller the radius the larger the coulombic attraction between the two ions. Increasing the electronegativity increases the
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C2HWsoln - CHM 3610 Summer 2005 HOMEWORK CHAPTER 2...

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