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Q.

What mass of magnesium hydroxide is required to neutralize 125 mL of 0.136M hydrochloric acid solution?
Substance Molar mass
$Mg (OH)_{2}$ $58.33 {g mol}^{- 1}$

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a

1.98 g

b

0.992 g

c

0.496 g

d

0.248g

answer is B.

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Detailed Solution

Here, the magnesium mass,

$\begin{aligned} [\frac{W}{58.33}] \times 2 = \frac{125 \times 0.136}{1000} \\ \Rightarrow W = 0.496 g \end{aligned}$

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