07 Notes - Ksp and Q - Aim How can you determine if a...

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Aim: How can you determine if a system has reached equilibrium? QQ: What are the different values that K eq can have, and what do they tell us about the reaction? Do Now: What does it really mean when an ionic solid is “slightly soluble?” Solubility Saturated solutions exist at equilibrium: AB (s) A + (aq) + B - (aq) Write the equilibrium expression for this system: K sp = [A + ] [B - ] *Ignore solids and liquids! K sp Solubility Product Constant Measures the solubility of ionic compounds in water. The bigger K sp is, the more soluble the salt! Practice: Write the dissociation equation and Ksp expression for each compound: BaSO 4 Ca(OH) 2 PbI 2 Na 3 PO 4 Don’t forget about the coefficients! Equilibrium Systems Reversible reactions may not always be at equilibrium… Equilibrium Quotient (Q): used to determine whether a system has reached equilibrium Q is calculated the same way as K eq Q = [products] / [reactants] K eq = Q System at equilibrium K eq > Q Reaction has to shift to the products side (forward reaction) to reach equilibrium
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