Solubility Product Constant  

The solubility product constant is a means of determining if a precipitate (solid) will occur when two solutions are mixed.  In order to calculate this, you must have a balanced equation and know the numbers of each ion produced. The concentrations of each product must be in moles per liter. Once you have those, look at the ions produced  and in particular their coefficients. In Chemical Calculations, it is assumed that you have only two products. You raise the concentration of each product to the power of their coefficient. Then you multiply the concentrations together. The result is the solubility product constant. If the number is greater than the experimental value for the solubility product constant, a precipitate will occur. If it is less than or equal to the solubility product constant, no precipitation will occur.
