Answer: 
 
Step-by-step explanation:
Spectator ions are defined as the ions which does not get involved in a chemical equation or they are ions which are found on both the sides of the chemical reaction present in ionic form. 
The given chemical equation is: 
 
The complete ionic equation is; 
 
The ions which are present on both the sides of the equation are 
 and 
 and are not involved in net ionic equation. 
Hence, the net ionic equation is :