`12.5 mL` of a solution containing `6.0 g` of a dibasic acid in `1 L` was found to be neutralized by `10 mL` a decinormal solution of `NaOH`. The molecular weight of the acid is

Options

A. 150
B. 120
C. 110
D. 75

Answer

A

Explanation

Dibasic acid `-= NaOH`
`12.5 mL` `10 mL xx 0.1 N = 1 mEq`
Strength of dibasic acid ` = 6 gL^(-1)`
mEq of acid = mEq of `NaOH`
`12.5 xx N = 1 mEq`
`(12.5 xx 6 xx 1000)/((Mw_(2))/(2) xx 1000) = 1`
`:. Mw` (acid) `= 150`