Q.

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 BaOH2 ?

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a

0.10 M

b

0.40 M

c

0.0050 M

d

0.12 M

answer is A.

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Detailed Solution

Number of milliequivalent of HCl = 20 x 0.050 x 1 = 1Number of milliequivalent of BaOH2= 2 x 30 x 0.1 = 6OH- of final solution = milliequivalents of Ba(OH)2-milliequivalent of HCltotal volume                                       =6-150 = 0.1 M
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