A saturated solution of lead(II) fluoride, PbF2, was prepared by dissolving solid PbF2 in water. The concentration of Pb2+ ion in the solution was found to be 2.08×10−3 M . Calculate Ksp for PbF2.

3.6×10-8 mol2dm-6

Explanation:

The solubility product is the equilibrium product of ions dissolved in water. It is an equilibrium constant obtained as the product of the molar solubility of the ionic species in solution raised to the appropriate power of their stoichiometric coefficients as shown in the image attached. See attached image for detailed solution.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.