What mass of Mg(OH)2 is required to neutralize 25 mL of 0.136 M hydrochloric acid solution? Molar mass of Mg(OH)2=58.33gmol−1
A
0.248 g
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B
0.496 g
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C
0.992 g
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D
1.98 g
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Solution
The correct option is C 0.496 g Mg(OH)2+2HCl→MgCl2+2H2O Number of moles of HCl=MV1000=0.136×1251000=0.017 ∵2 mole HCI is neutralized by 58.33g of Mg(OH)2 ∴0.017 mole HCl will be neutralized by 58.332×0.017g of 2Mg(OH)2=0.496g