Constants I Periodic Table When excess solid YZ is put in wa

Constants I Periodic Table When excess solid YZ is put in water and allowed to dissolve the following equilibrium reaction occurs and the equilibrium table shown can be set up. Y(aq) Z(aq) initiallexcess 0 +2 [changel equilibrium excess x The amount of solid that dissolves is called the molar solubility, denoted here by z. Since the concentration the solid is constant and is not included in the Kap expression, the equilibrium expression for the reaction isKg = MZ], or, in terms of molar solubility, +c tc

Solution

The solubility product Ksp of a partially soluble ionic substance that dissociates into ions A and B with the formula A_mB_n is given by Ksp = [Aⁿ⁺]^m[B^m-]ⁿ which when expanded in terms of moles or equivalents of each type of ion released in the medium gives Ksp as Ksp = [mx]^m[nx]ⁿ giving those many moles of total ions.

Thus in case of a molecule of formula AB₂, the Ksp will be [A][2B]² which in terms of x will be Ksp = [x][2x]² giving x*4x² = 4x³.

Similarly, for C2D3, Ksp will be [2C]²[3D]³ which gives (2x²)*(3x³) = 6x⁵.