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Question
Write down the changes that will be seen in the instance and explain the reason behind them.
Two drops of the indicator phenolphthalein were added to a 10ml solution of sodium hydroxide.
Solution
Phenolphthalein is an indicator used for determining the quantity of base. When two drops of Phenolphthalein indicator are added to a 10 mL solution of Sodium hydroxide, the solution turns pink in colour because the acidic part of phenolphthalein reacts with the base, forming sodium salt of phenolphthalein which has a pink colour.
For example: In acid-base titration phenolphthalein is used to detect the endpoint of the base.
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