What is the [OH]^- in the final solution...

What is the `[OH]^-` in the final solution prepared by mixing 20 mL of 0.05 M HCl with 30 Ml of 0.10 M`Ba(OH)_2` ?

A

0.40 M

B

0,050 M

C

0.12 M

D

0.10 M

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The correct Answer is:

D

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