Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?

Question

As per the following equation, 0.217 g of HgO (molecular mass = 217 g mol$^{-1}$) reacts with excess iodide. On titration of the resulting solution, how many mL of 0.01 M HCl is required to reach the equivalence point? \[ \text{HgO} + 4\text{I}^- + \text{H}_2\text{O} \rightarrow \text{HgI}_4^{2-} + 2\text{OH}^- \]

Answer 1

For titrations of strong bases (sodium hydroxide) with weak acids (oxalic acid), phenolphthalein serves as an effective indicator. The endpoint is marked by a transition from a colorless state in acidic conditions to a pink hue in basic conditions.

List I	List II
A. The Evil Quartet	III. Causes of biodiversity losses
B. Ex situ conservation	I. Cryopreservation
C. Lantana camara	II. Alien species invasion
D. Dodo	IV. Extinction

Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?

The Correct Option is C

Solution and Explanation

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