An aqueous solution of `6.3 g` oxalic acid dihydrate is made up to `250 mL`. The volume of `0.1 N NaOH` required to completely neutralise `10 mL` of this solution is

Options

A. 40 mL
B. 20 mL
C. 10 mL
D. 4 mL

Answer

A

Explanation

Eq. mass of `{:("COOH"),("|"),("COOH"):}.2H_(2)O`
`=(126)/(2)=63`
Normality of oxalic acid
`=(6.3)/(63)xx(1000)/(250)=0.4N`
`underset("Oxalic acid")(N_(1)V_(1))=underset("NaOH")(N_(2)V_(2))`
`0.4xx10=0.1xxV_(2)`
`V_(2)=40mL`