4. (20 points) A metal plating facilitate produces hazardous waste that contains 50 mg/L ofcopper (Cu2+). Caustic soda (i.e. sodium hydroxide; NaOH) is added to the waste to raisethe pH

and cause precipitation of copper hydroxide (Cu(OH)2) according to the followingreaction: C u^{2+}+2 O H^{-} \leftrightarrow C u(O H)_{2} Copper hydroxide has a Ksp of 2.00×1019. The goal of the treatment process is to reducethe copper concentration to 1.3 mg/L.Dotoumhuduo a) Determine the hydroxide concentration (in moles/L) to which the solution needs to beraised to achieve the target copper concentration. a) Determine the hydroxide concentration (in moles/L) to which the solution needs to beraised to achieve the target copper concentration. b) What is the pH of this solution?