The ionic equation for copper(II) sulfate (CuSO4) can be written as follows:
CuSO4 (aq) -> Cu2+ (aq) + SO4^2- (aq)
In this equation, CuSO4 dissociates in water, forming copper ions (Cu2+) and sulfate ions (SO4^2-). The (aq) notation indicates that the compounds are in aqueous (dissolved in water) form.