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Q.

What volume (in mL) of 0.0500 M phosphoric acid is needed to titrate completely 25.0 mL of 0.160 M barium hydroxide solution to a phenolphthalein end point?
$3 Ba (OH)_{2} + 2 H_{3} {PO}_{4} ⟶ {Ba}_{3} {({PO}_{4})}_{2} + 6 H_{2} O$

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a

150

b

100

c

75.0

d

50.0

answer is A.

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Detailed Solution

The volume needed in given conditions;

$V \times 0.05 \times 3 = 25 \times 0.15 \times 2 \Rightarrow V = 50 mL$

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What volume (in mL) of 0.0500 M phosphoric acid is needed to titrate completely 25.0 mL of 0.160 M barium hydroxide solution to a phenolphthalein end point?3Ba(OH)2+2H3PO4⟶Ba3PO42+6H2O