Equivalent moles of oxalic acid =‌ Equivalent moles ‌‌ of ‌KMnO4 =‌N1V1=25×0.2×10−3=5×10−3=0.005 ‌‌
‌ Weight of oxalic acid ‌
‌ Eq. weight of oxalic acid ‌
=0.005 ‌‌‌‌ Weight of oxalic acid ‌=0.05×63=0.315g ‌∴0.315‌ g in ‌50‌ cc of oxalic acid. ‌ ‌‌ In ‌500‌ ce solution, mass of oxalic acid is ‌ ‌=0.315×‌