Answer:The Ksp expression for the system
![K_(sp)=[Pb^(2+)][Cl^-]^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/s56gnrs0y8ewj88mg6jv3o3h9j4kofa4p9.png)
Explanation:
The
od the substance that solubility product is defined as mathematical product of concentration of dissolved ions raised to the power equal to their stoichiometric coefficient in reaction.

![K_(sp)=[A^(3+)]^2* [B^(2-)]^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/390iqhwxxepj0qn6msl5kpu5qoly7htopd.png)
For the given system:

![K_(eq)=([PB^(2+)][Cl^-]^2)/([PbCl_2])](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4138mpokst1y9a39dlciaj4hta5ujkbj1b.png)
![K_(eq)* [PbCl_2]=K_(sp)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/gfspnzxn180n4byhfggxxcayyddkroci6i.png)
![K_(sp)=[Pb^(2+)][Cl^-]^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/s56gnrs0y8ewj88mg6jv3o3h9j4kofa4p9.png)
The Ksp expression for the system :
![K_(sp)=[Pb^(2+)][Cl^-]^2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/s56gnrs0y8ewj88mg6jv3o3h9j4kofa4p9.png)