# why colour of CuSO4 and CuCl3 is different? [duplicate]

• Do you really mean $\ce{CuCl3}$ or is it just a typo and you thought in $\ce{CuCl2}$? On a second note, copper(II)sulfate itself undergoes a colour change when converting the pentahydrate to the anhydrous form. – Klaus-Dieter Warzecha Mar 13 '15 at 6:37