The compound [Co(H2O)4Cl2]Cl is a coordination compound. It consists of a central cobalt (Co) ion bonded to four water (H2O) molecules and two chloride (Cl) ions. The coordination number of the cobalt ion is 6, as it is surrounded by four water molecules and two chloride ions.
[CO(H2O)4Cl2]Cl is the chemical formula for a complex ion called hexaaquacobalt(II) chloride. It consists of a central cobalt ion (Co2+) coordinated with four water molecules (H2O) and two chloride ions (Cl-). The whole complex ion is then surrounded by an additional chloride ion (Cl-) to balance the charge.
