What is the color of CuCl2?
If it is a solution its color is blue (but a bit green) . If it in solid state its color is greenish blue.
To what volume should you dilute 131ml of an 7.95M CuCl2 solution so that 50.5ml of the diluted solution contains 5.8g CuCl2?
This is just a matter of changing the density. You want to get 5.8g/50.5mL. You currently have 7.95 moles/Liter of CuCl2. 1 mole of CuCl2 is roughly 134.5g. Therefore 7.95 moles/Liter of CuCl2 is roughly 1069.275g/L=1.069g/mL.=1g/0.9352mL 5.8g/50.5mL= 1g/8.707mL. So you need to add some amount to .9352mL to get to 8.707mL. Well this is now simply subtraction. 8.707-.9352=7.7718