19 Acids & Bases

19 Acids & Bases - 1 1 Enthalpy of Solution H solution...

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Unformatted text preview: 1 1 Enthalpy of Solution H solution = lattice energy + hydration energy Energies (kJ/mol) Associated with Solvation 66- 851 + 917 AgCl 4- 783 + 787 NaCl H solutn Hydration Energy Lattice Energy Com- pound Can you explain why AgCl is insoluble and NaCl is soluble in water using these data and other knowledge that you have? A) Yes B) Maybe, not sure C) No 2 The lattice energy of CaCl 2 is +2175 kJ/mol, the hydration energy is -2258 kJ/mol, and the entropy of solution is S o = - 44 J/mol K. 1. The process of dissolving CaCl 2 in water is __________. A) endothermic B) exothermic H = 2175 + (-2258) = - 83 kJ/mol 2 3 The lattice energy of CaCl 2 is +2175 kJ/mol, the hydration energy is -2258 kJ/mol, the enthalpy of solution H o = – 83 kJ/mol, and the entropy of solution S o = - 44 J/mol K . 2. CaCl 2 is __________in water at 298 K. A) very soluble B) relatively insoluble 1 ln( ) o o H S K R T R = 28.2 R = 8.314 J/mol K 4 The lattice energy of CaCl 2 is +2175 kJ/mol, the hydration energy is -2258 kJ/mol, the enthalpy of solution H o = – 83 kJ/mol, and the entropy of solution S o = - 44 J/mol K. 2. As the temperature increases, the solubility of CaCl 2 _________. A) increases B) decreases 1 ln( ) o o H S K R T R R = 8.314 J/mol K At 500 K, ln(K) = 14.7, down from 28.2 at 298 K . 3 5 MSJ reading on solubility (optional) pp. 845-848 and 856-858 QRT solubility problems (optional) Ch. 17: 54, 55, QRT Homework Ch 16: 12, 22, 26, 33, 39 Homework...
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This note was uploaded on 06/29/2008 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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19 Acids & Bases - 1 1 Enthalpy of Solution H solution...

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