20 mL of 0.2 M NaOH(aq) solution is mixe...

20 mL of 0.2 M NaOH(aq) solution is mixed with 35 mL of this 0.1 ML NaOH (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 `(H_(2)C_(2)O_(4))` The mass of impure is:

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