* Sodium hydroxide (NaOH) is a strong base. This means it readily releases hydroxide ions (OH-) in solution.
* Phenolphthalein is a pH indicator. It changes color depending on the acidity or basicity of the solution.
* In acidic solutions, phenolphthalein is colorless.
* In basic solutions, phenolphthalein turns pink.
The Reaction:
When you add sodium hydroxide to a solution containing phenolphthalein, the hydroxide ions from the NaOH react with the phenolphthalein molecules. This reaction causes the phenolphthalein to change its molecular structure, resulting in the pink color.
Here's a summary:
* Start: You have a colorless solution of phenolphthalein.
* Add NaOH: The solution becomes basic due to the hydroxide ions.
* Color Change: The phenolphthalein turns pink, indicating the presence of a basic solution.
This is a common experiment used in chemistry to demonstrate the properties of acids and bases and to identify the presence of a base.
