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5 . 00   mL of 0 . 10   M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphthalein indicator. The volume of NaOH required for the appearance of permanent faint pink color is tabulated below for five experiments. What is the concentration, in molarity, of the NaOH solution? Exp. No. Vol. of NaOH mL 1 12 . 5 2 10 . 5 3 9 . 0 4 9 . 0 5 9 . 0

Correct answer

0.11

Step-by-step solution

True data for NaOH used volume = 9 ml Milli equivalent of H 2 C 2 O 4 = Milli equivalent of NaOH 5 × 0 . 1 × 2 = 9 × × M × 1 x = 1 9 = 0 . 11 M

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