Saturday, April 11, 2009

Summary On Equilibrium Constants 2

Kc
Definition: Equilibrium constant is a measure of the ratio of concentrations of products and reactants at equilibrium.
What the value of K measures: equilibrium concentration
Type of system K applies to: molarity, system at equilibrium
Example of an equation (include state symbols): CO(g)+Br2(g) COBr2(g
)Expression for K: Kc=[CoBr2]/[CO][Br2]
Unit:mol dmˉ³

Kp
Definition: For reactions involving gases, the equilibrium constant of a gaseous reaction can also be expressed in terms of partial pressure.
What the value of K measures: equilibrium pressure
Type of system K applies to: reaction involve gases, system at equilibrium
Example of an equation (include state symbols): equilibrium
Expression for K:Kp=(PNH3)^2/(PN2)(PH2)^3

Unit Pa

Kw
Definition: The overall constant. Kw, is called teh ionic product for water.
What the value of K measures: dissociation of overall constant
Type of system K applies to: equilibrium
Example of an equation (include state symbols): H2O(l) H+(aq)+OH-(aq)
Expression for K: Kw=[H+][OH-]
Unit: mol² dm^6


Ka
Definition: Ka provides an accurate measure of the extent to which an acid is dissociated.
What the value of K measures: acid dissociation constant
Type of system K applies to: equilibrium
Example of an equation (include state symbols): HA(aq)+H2O(l) H3O+(aq)+A-(aq)
Expression for K: Ka=[H3O+][A-]/[HA]
Unit: mol dmˉ³


Kb
Definition: Kb provides an accurate measure of the extent to which an alkali is dissociated.
What the value of K measures: base dissociation constant
Type of system K applies to: equilibrium
Example of an equation (include state symbols): B(aq)+H2O(l) BH+(aq)+OH-(aq)
Expression for K: Kb=[BH+][OH-]/[B]
Unit:
mol dmˉ³

Ksp
Definition: The solubility of a substance is the quantity that dissolves to form a saturated solution.
What the value of K measures: solubility product
Type of system K applies to: equilibrium
Example of an equation (include state symbols): PbBr2(s) Pb2+(aq)+2Br-(aq)
Expression for K:Ksp=[Pb2+][Br-]2
Unit: g dmˉ³;mol dmˉ³

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