Equilibrium Calculator 2.0 calculates the equilibrium concentrations of all the reagents in an arbitrary chemical reaction with as many as 10 species.
aA + bB + cC...  xX + yY + zZ...
The input data are:
- The reagent exponents in the equilibrium constant expression. These are the stoichiometric coefficients in the balanced equation except that reactant coefficients are entered as negative numbers and product coefficients as positive numbers.
- The initial concentrations of the chemical species. Species present in unit activity (insoluble solids, solvents, etc.) are treated by appending an asterisk (*) to their "concentration".
- The equilibrium constant, Keq.
For a discussion of the method used to solve for the equilibrium concentrations in single step equilibria, see: Weltin, E. J. Chem. Educ. 1990, 67, 548; 1991, 68, 486. The method can also be extended to polyprotic acids, stepwise ligand binding, competing and coupled reactions, see: Weltin, E. J. Chem. Educ. 1992, 69, 393; 1993, 70, 568. Equilibrium Calculator does not provide these extensions.
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The update of Equilibrium Calculator allows more flexibility in the number of reactants and products.
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