The amount of oxalic acid in a solution can be determined by titration with $KMnO_4$ in the presence of $H_2SO_4$. If the titration is performed in the presence of $HCl$,the results are unsatisfactory because $HCl$ ...
- Aoxidizes oxalic acid to carbon dioxide and water.
- Bis oxidized by $KMnO_4$ to chlorine.
- Cincreases the concentration of $H^+$ ions from oxalic acid.
- Dreduces $Mn^{2+}$ ions.
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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?
$Exp. \ No.$ $Vol. \ of \ NaOH \ (mL)$ $1$ $12.5$ $2$ $10.5$ $3$ $9.0$ $4$ $9.0$ $5$ $9.0$
| $Exp. \ No.$ | $Vol. \ of \ NaOH \ (mL)$ |
| $1$ | $12.5$ |
| $2$ | $10.5$ |
| $3$ | $9.0$ |
| $4$ | $9.0$ |
| $5$ | $9.0$ |
Which of the following titrations is methyl orange the best indicator for?
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View SolutionThe indicator used during the estimation of $COD$ of a water sample is
The indicator used in the titration of iodine against sodium thiosulphate is
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View SolutionCan titrations with $KMnO_4$ be performed in the presence of $HCl$? Why?
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