Hcoo h o hcooh 3 k2 hcoo h o 3 hcooh k2 1

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Unformatted text preview: HCOOH 3 K2 HCOO H O 3 HCOOH K2 1 K1 AgCl(s) in water After adding NH3(aq) Reaction Equations and Equilibrium Constants Gases: The Equilibrium Constant, KP Deriving an Equilibrium Constant from Others If we can add the equations of two or more reactions to obtain a balanced chemical equation for another reaction balanced chemical equation for another reaction, K for the net reaction is the net reaction is the product of the equilibrium constants of the other reactions at the same temperature. EXAMPLE AgCl (s) in water: AgCl (s) ⇌ Ag+ (aq) + Cl- (aq) After adding NH3(aq) : Ag+ (aq) + 2 NH3 (aq) ⇌ Ag(NH3)2+ (aq) K2 Net: Knet AgCl (s) + 2 NH3 (aq) ⇌ Ag(NH3)2+ (aq) + Cl- (aq) Knet = K1 x K2 Mixtures of gases are solutions just as liquids are. Use KP, based upon activities of gases. 2 2 SO2(g) + O2(g) PSO3 P 2 SO3(g) PSO2 P P KP = (aSO3) (aSO2)2(aO2) aSO3 = PO2 P K1 aSO3 = aSO2 = KP = (PSO3 )2 (PSO2)2(PO2 ) 5 Gases: The Equilibrium Constant, KC Gases: The Equilibrium Constant, KC 2 SO2(g) + O2(g) (aSO3)2 (aSO2)2(aO2) = P (PSO3 )2 (PSO2)2(PO2 ) ([SO3] RT)2 ([SO2] RT)2([O2] RT) ([SO3])2 ([SO2 ])2([O 2]) In concentration we can do another substitution 2 SO2(g) + O2(g) [SO3]= nSO3 V = PSO3 RT PX (aX ) = [X] = c◦ RT c◦ PX = [X] RT = P RT [SO2]= 2 SO3(g) PSO2 RT [O2] = PO2 RT KP = 2 SO3(g) PX = [X] RT = P = KC RT Where P = 1 bar An Alternative Derivation 2 SO2(g) + O2(g) PSO3 Kc = 2 2 Pure Liquids and Solids 2 SO3(g) Where P = 1 bar [SO3] PSO3 RT = = RT 2[O ] 2 2 [SO2] 2 PSO2...
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