NaOH is a base which turns phenolphthalein pink.
What are bases?
A base is a substance that can accept protons or donate a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.
Although acids and bases in solution can conduct electricity due to the presence of free ions available to carry charges.
Bases turn phenolphthalein indicator pink; as opposed to acids which give colourless test on the indicator.
Hence, NaOH is a base which turns phenolphthalein pink.
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