Science / Chemistry / Equilibrium Constant: The product of the concentrations of the products, divided by the product of the concentrations of the reactants, for a chemical reaction at equilibrium. For example, the equilibrium constant for A + B = C + D is equal to [C][D] / ([A][B]), where the square brackets indicate equilibrium concentrations. Each concentration is raised to a power equal to its stoichiometric coefficient in the expression. The equilibrium constant for A + 2B = 3C is equal to [C]3/([A][B]2). For gas phase reactions, partial pressures can be used in the equilibrium constant expression in place of concentrations.
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Science / Chemistry / Base Hydrolysis Constant: The equilibrium constant for the hydrolysis reaction associated with a base. For example, Kb for ammonia is the equilibrium constant for NH3(aq) + H2O(ell) doublearrow NH4+(aq) + OH-(aq), or Kb = [NH4 MORE
Science / Chemistry / Acid Dissociation Constant: (Ka) acid ionization constant. Compare with base hydrolysis constant. The equilibrium constant for the dissociation of an acid into a hydrogen ion and an anion. For example, the acid dissociation cons MORE
Technology / Radar / Fast Time Constant (FTC) Circuit: An electronic circuit designed to reduce the undesirable effects of clutter. With the ftc circuit in operation, only the nearer edge of an echo having a long time duration is displayed on the radarsco MORE