Question

Find the volume of 0.4 M $Ba\left(OH{)}_2\right(aq)$ required to exactly neutralize 100 milliliters of 0.2 M $HBr\left(aq\right)$.

• A. $25mL$
• B. $50mL$
• C. $100mL$
• D. $200mL$
• E. $400mL$

Answer 1

The correct option is A $25mL$

1 mole of barium hydroxide will neutralize 2 moles of $HBr$.
Let V ml of 0.4 M barium hydroxide is required to neutralise 100 mL of 0.2 M $HBr.$
$0.4M\times V=\frac{0.2M\times 100mL}{2}$
$V=25mL$