The complete reaction would be:
Pb(NO₃)₂ (aq) + 2 NaCl (aq) --> PbCl₂ (s) + 2 NaNO₃ (aq)
Only substances in aqueous state would dissociate. Thus,
Pb²⁺ + 2 NO₃⁻ + 2Na⁺ + 2Cl⁻ --> PbCl₂ + 2Na⁺ + 2NO₃⁻
The spectator ions are the ions that both appear in the left and right side of the reaction. Therefore, these are Na⁺ and NO₃⁻ ions.
