$5.00 \ mL$ 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?
$Exp. \ No.$ $Vol. \ of \ NaOH \ (mL)$ $1$ $12.5$ $2$ $10.5$ $3$ $9.0$ $4$ $9.0$ $5$ $9.0$
| $Exp. \ No.$ | $Vol. \ of \ NaOH \ (mL)$ |
| $1$ | $12.5$ |
| $2$ | $10.5$ |
| $3$ | $9.0$ |
| $4$ | $9.0$ |
| $5$ | $9.0$ |
- A$0.11$
- B$0.15$
- C$0.20$
- D$0.25$
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