i have BaCl2.2H2O ,how can i get BaCl2.6H2O from it.

Question

or
i have CuCl2.2H2O how can i get CuCl2.6H2O from it.

actually i am working in the field of nanotechnology. trying to prepare nano-ferrites. now am trying to prepare copper doped barium hexaferrites.help me if u can