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Nov_21 - Suggested Problems for 21 27 29 37 39 55 61...

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Suggested Problems for Chapter 10 19, 21, 27, 29, 37, 39, 55, 61
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Equilibrium Constants For a general equilibrium: w W + x X y Y + z Z Equilibrium constant: Where a N 's are activities at equilibrium pure solid: activity = 1 pure liquid: activity = 1 solutions: activity = [solute] in M gases: activity = P gas in atm. K eq = a Y y a Z z a W w a X x
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An equilibrium is established when: " rates of dissolution and precipitation are equal " there is sufficient solute present to have some remaining at equilibrium Solubility Equilibria A solute (g,l,s) A solute (sol'n)
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Solubility " Amount of solute that dissolved in a saturated solution. " " Solubility depends on the intermolecular forces versus solvent-solute interactions " “like dissolves like”
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Solubility Product - K sp A x B y (s) x A +m + y B -n Solubility product is K eq K eq = K sp = [ A +m ] x [ B -n ] y [ A x B y ] = [ A +m ] x [ B -n ] y Larger K sp → higher solubility Solubility often tabulated as (g solute) / (100 g solvent) K sp ≠ solubility (in g solute/100 g of solvent)
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Common Ion Effect e.g. PbCl
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