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ch12.docx - Ch 12 Solutions entropy H soln = H solute H...

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Ch. 12 Solutions entropy ΔH soln = ΔH solute + ΔH solvent + ΔH mixture heat of hydration : 1 mol gaseous solute ions dissolved in water (ΔH hydration = ΔH solvent + ΔH mixture ) ΔH soln = = ΔH solute + ΔH hydration ΔH soln = - ΔH lattice + ΔH hydration ΔH solute = - ΔH lattice typically exothermic, but can be endothermic (if too positive soln won’t form) dynamic equilibrium saturated/unsaturated/supersaturated solutions Solubility of most solids in water incr with incr temp recrystallization Solubility of gases decr with temp, incr with pressure ex: carbonated soda bubbles when pressure is released upon opening Henry’s Law- S gas = K H P gas K h depends on specific solute and solvent and temperature; S usually in M, P usually in atm **ammonia has largest K because it is the only polar gas (more soluble with water)** colligative properties depend on amt solute not the type non-volatile solute dissolves in soln
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