Lecture2 - 1) Mass NaCl needed? 2) Molarity of solution? 3)...

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Solution Composition, Formation, and Solubility Reading: 11.1 to 11.3 HW: Page 531 # 11, 16, 29, 33, 40, 43
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Solutions Solute dissolved in solvent Homogeneous mixture
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Dissolving – Ionic vs. Molecular
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Electrolyte Dissociation KF(s) NaNO 3 (s) CaCl 2 (s) Na 3 PO 4 (s) (NH 4 ) 2 SO 4 (s) Non-electrolytes – molecular solids (sugars, alcohols, etc.)
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Van’t Hoff Factor (i solute ) Number of particles formed in solution per formula unit of solute Van’t Hoff Factor? C 6 H 12 O 6 NaCl CaCl 2 Na 3 PO 4 (NH 4 ) 2 SO 4
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Heat of Solution
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Heat of Solution
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Heat of Solution Lattice Energy + Enthalpy Hydration = Enthalpy of Solution
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Concentration Solute to solution ratio Solute to solvent ratio Concentrated vs. dilute
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Measure Formula Unit molarity (M) mol solute / L sol’n mol / L molality (m) mol solute / kg solvent mol / kg mole fraction (X) moles / total moles none mass percent (%) mass solute / mass sol’n * 100 %
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500 g of 0.90% saline solution, NaCl(aq), are needed. The density of the saline solution is 1.1 g/mL. NaCl is 58.4 g/mol.
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Unformatted text preview: 1) Mass NaCl needed? 2) Molarity of solution? 3) Molality of solution? 4) Mole fraction of NaCl? 25.0 g of Mg(NO 3 ) 2 added to 200. g water to make a solution with a density of 1.0 g/mL. Mg(NO 3 ) 2 is 148 g/mol 1) % by mass Mg(NO 3 ) 2 ? 2) M of Mg 2+ ? 3) M of NO 3-? 4) m of Mg 2+ ? 5) m of NO 3-? 6) X of Mg(NO 3 ) 2 ? Solubility Guidelines Polar Solvent *dissolves soluble ionic solutes (electrolytes) *dissolves polar solutes (nonelectrolytes) Nonpolar Solvent *dissolves nonpolar solutes (nonelectrolytes) Molecule Ion Interaction Intermolecular Forces Like Dissolves Like Solubility and Temperature Ionic Solutes *solubility usually increases as temp. increases Gaseous Solutes *solubility decreases as temp. increases Gaseous Solutes Solubility and Pressure Henrys Law *Solubility of a gas is directly proportional to pressure above the solution Pressure Above Solution Pressure and Solubility...
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This note was uploaded on 08/26/2011 for the course CHEM 104 taught by Professor Quigley during the Spring '08 term at CUNY Hunter.

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Lecture2 - 1) Mass NaCl needed? 2) Molarity of solution? 3)...

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