Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour…
Which indicator is used in the titration of sodium hydroxide against oxalic acid and what is the colour change at the end point?
Phenolphthalein, pink to yellow
Alkaline $\mathrm{KMnO}_4$, colourless to pink
Phenolphthalein, colourless to pink
Methyl orange, yellow to pinkish red colour
Solution
For weak acid and strong base titration, phenolphthalein is used as indicator. In acidic medium phenolphthalein is colourless while in alkaline medium it is pink in colour.