Q.

12.5 mL of a solution containing 6.0 g of a dibasic acid in I L was found to be neutralized by 10 mL of a decinormal solution of NaOH. The molecular weight of the acid is

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a

150

b

120

c

110

d

75

answer is A.

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Detailed Solution

Dibasic acid  NaOH 

1.5 mL                10 mL x 0.1 N = 1 mEq

Strength of dibasic acid = 6 g L-1

mEq of acid = mEq of NaOH

12.5×N=1mEq12.5×6×1000Mw2×1000=1Mw( acid )=150
 

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