What is the [ OH -] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2 ? -

1. A. 0.12 M
2. B. 0.10 M
3. C. 0.40 M
4. D. 0.0050 M

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