The pH range over which an indicator alters the color defines the transition interval of an indicator.
What do you mean by Transition?
A Transition may be defined as a condition or process where one state of a compound changes into the other.
A Transition interval is a point where the color of indicators may change. For example, Phenolphthalein changes pink from colorless at a pH of 8-10. So, this point is called the transition interval.
Therefore, the pH range over which an indicator alters the color defines the transition interval of an indicator.
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