Copper (II) chloride solubility is in the range of 45 g (mass of anhydrous salt) per 100 g of H2
O (solution density well over 1.2). You may convert that to Kso
, although saturated solution has a high ionic strength (around 16), so take the number obtained with a grain of salt. That's not a sparringly soluble salt, thats why Kso
is not listed in tables. What was amount and concentration of HCl added?
My guess is that adding NaCl would precipitate CuCl2 but the amount would be affected by the pH of the solution, which would become basic.
Please elaborate - why do you expect pH to rise after NaCl addition?