[meenu]

calculate molecular weight  of diprotic acid

The mass of the unknown diprotic acid = 0.326 g
 Concentration of NaOH = 0.1000 M
first equivalence point  vol = 6.54 ml
H2X + NaOH <---> NaHX + H2O

answer options is
Oxalic Acid   H2C2O4                90
Maleic Acid   H2C4H2O4   116
Malic Acid   H2C4H4O5   134
Tartaric Acid   H2C4H4O6   150


i know       acid : base  ratio is 1:2 for diprotic acid
using M V  _acid == M  V _base
at first equivalence point            moles of acid == moles of base
at second equivalence point     2 moles of acid ==   moles of  base

also molecular weight  == grams of acid / mols of acid
 im really confused with calculations , how to get the mols of acid  

[enahs]

http://www.chemicalforums.com/index.php?topic=29441.0
I guess you two are lab partners.

[meenu]

No  ,  we are not .