Question
20 mL of 0.2MNaOH(aq) solution is mixed with 35 mL of 0.1MNaOH(aq) solution and the resultant solution is diluted to 100 mL. 40 mL of this diluted solution reacted with 10% impure sample of oxalic acid (H2C2O4). The weight of impure sample is :