Ionic EquilibriumMedium
Question
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:
Options
A.pinkish red to yellow
B.yellow to pinkish red
C.pink to colorless
D.colorless to pink
Solution
Sol. [Key Concept: Phenolphthalein — indicator range for strong-base titration]
Color of Phenolphthalein before the end point = colorless.
Color of Phenolphthalein close to equivalence point = Pink.
∴ Color change = Colorless to pink.
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