Write the ksp expression for the sparingly soluble compound zinc phosphate, zn3(po4)2.

The give compound is a sparingly soluble salt, . The solubility equilibrium for this compound can be represented as:

Initial(M)                      -                            0                   0

Change(M)                 -                          +3x                +2x

Equilibrium(M)            -                           3x                  2x

Solubility product expression for this equilibrium will be:

              =

Where x will be the molar solubility of the compoundat that given temperature.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3