Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change that is observed at an alkaline pH close to the equivalence point during this titration is:
Text Solution
Verified by ExpertsC
In acidic medium due to common ion effect equilibrium lies to the left so solution will be colourless.
In alkaline medium, the ionisation of HPh increases due to odd ion effect so the concentration of 
ions increases which imparts pink colour to solution.
──────────────────────────────────────────────────────────────────────────────────────────
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems