Logged What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?
It is possible to multiply ionic concentrations and obtain a value less than this solubility product; in such cases the solution is too dilute, and no equilibrium exists. Most graciously, this last piece of information has been given to you, although you'll have to convert it to a molarity.
This page discusses how solubility products are defined, including their units units. Journal of the American Chemical Society1 Physical Chemistry Chemical Physics18 41 In order for this equilibrium constant the solubility product to apply, solid barium sulfate must be present in a saturated solution of barium sulfate.
If Q moles of barium sulfate are added to 1L of water, and this is the most moles that 1L of water can hold, how much of barium and sulfate ion are in solution?
Borreguero, Timothy R. This is true of any "insoluble" ionic compound.