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Q.

What approximate volume of 0,40 M Ba(OH)2 must be added to 50,0 mL of 0.30 M NaOH to get a solution in which the molarity of the OH- ions is 0.50 M?

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a

66 m 

b

133 mL

c

100 m

d

33 mL

answer is A.

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Detailed Solution

Suppose, V is the volume required. Then,

0.4×V×2+50×0.350+V=0.50

V=33 mL.

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What approximate volume of 0,40 M Ba(OH)2 must be added to 50,0 mL of 0.30 M NaOH to get a solution in which the molarity of the OH- ions is 0.50 M?