Using the appropriate Ksp values, find the concentration of Cu2+ ions in the solution at equilibrium after 550 mL of 0.30 M aqueous Cu(NO3)2solution has been mixed with 350 mL of 0.25 M aqueous KOH solution. (Enter in M.) (Ksp for Cu(OH)2 is 2.6x10-19). CORRECT ANSWER: 0.135 Now find the concentration of OH− ions in this solution at equilibrium. (Enter in M.) I got 1.0e-9 but it says its wrong. Am I doing this right? Please help!

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