Question

20ml 0.2 M NaOH solution is taken in a conical flask and is titrated with 0.05 M oxalic acid (H2C2O4) solution using phenolphthalein as the indicator. What is the concentration of oxalate C2O4ion in the conical flask just when the pink colour disspears ?

 a)M/30  b)M/25  c)M/20  d)M/60

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