Solubility Products for Pc

1. To start calculation user is required to fill in stoichiometric coefficients, initial concentrations of available components, solution volume and equilibrium constant Ksp or Solubility.

2. Application derives final, equilibrium concentrations of solutes based on equilibrium constant (Ksp), initial concentrations, solubility and stoichiometric coefficients.

3. The power of equilibrium constant units depicted as “x” is defined as (a+b+c), where a, b and c are the stoichiometric coefficients of the reaction.

4. If Q is not equal to reaction equilibrium constant Ksp, then reaction is not at equilibrium and it will proceed (due to difference in forward and reverse reaction speeds) to the direction defined by Q.

5. Solubility Products is a tool for accurate estimation of concentrations of solutes upon dissolution of solid compounds of low solubility.

6. Upon selection of the compound from database, app will provide balanced dissolution reaction and equilibrium constant.

7. Beware of transformations accompanied with filling and deleting of Mw value! Once Mw value is filled in and “Done” is pressed (!), a solid mass and solubility are recalculated to new units.

8. Apparently Q>K, suggesting that reaction is too close to the products side and reverse reaction (precipitation) will prevail to bring the reaction back to the equilibrium.

9. For given reaction: S(s) = 2A + 1B +3C, initial reaction concentrations are Ao=0.1M, Bo=0.2M, Co=0.3M and Ksp=1e-6 M6.

10. When Molar mass (Mw) of solid is filled in, then solid mass and solubility calculated and inserted in g/l units, otherwise it is set to mole/l.

11. Apparently, solving this equation is rather demanding task, that turns to be unnecessary, since “Solubility Products” app immediately returns the answer: Aeq=28.98mM, Beq=0.1645M, Ceq=0.1935M and additionally 0.036 mole of solid precipitated.

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