Unformatted text preview: .0100 0.0037 0.0175 0.0150 0.0100 0.0037 0 0.0050 0.0150 0.0276 Law of equilibrium: for a given reaction at a specified temperature, all equilibrium mixtures have the same value of the reaction quotient value of the reaction quotient (Q). This numerical value This numerical value of Q is called the equilibrium constant (K). Q HI 2 H 2 I 2 0 0.111 2.25 56 Concentration at time 2 (mol L-1 ) Concentration at time 3 (mol L-1 ) The Reaction Quotient and the Equilibrium Constant The Reaction Quotient and the Equilibrium Constant The form of Q and K
For reactions involving solids, concentration terms for the solids are not incl solids are not included in expressions for Q or K. in for CaCO3(s) ⇌ CaO(s) + CO2 (g)
Q CO2 Activity-based Equilibrium Constants
Reaction quotients are most correctly expressed as quotients are most correctly expressed as functions of activities of species rather than as concentrations. Activities are measures of effective concentration, and as a ratio compared with 1 mol L-1, are unitless. In sufficiently dilu...
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