* Tin(II) chloride: This indicates the ionic compound formed by tin in its +2 oxidation state and chloride ions (Cl⁻). The formula for this is SnCl₂.
* Dihydrate: This means two water molecules (H₂O) are associated with each formula unit of the salt.
Therefore, the formula for tin(II) chloride dihydrate is SnCl₂ · 2H₂O