Calculate the weight of a sample of impure oxalic acid that should be taken for titration by 0.5000 N NaOH so that the percentage of H2C2O4.2H2O will be twice the buret reading?
Molar Mass of NaOH = 39.997
= 0.5 × 39.997
= 19.999+60 = 79.999
Molar Mass of H2C2O4.2H2O = 126.07