A sample of 60 mL of 0.4 M NaOH is added to 40 mL of 0.6 M Ba(OH)2. What is the hydroxide concentration [OH–] of the final solution?

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A sample of 60 mL of 0.4 M NaOH is added to 40 mL of 0.6 M Ba(OH)2. What is the hydroxide concentration [OH–] of the final solution?