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This is a pH indicator.
Indicates whether the substance is an acid or alkali.
An indicator
why universal indicator is called universal indicator?
One would add phenolphthalein as an indicator for bases with a pH of 8.2 to 10.0 If the phenolphthalein changes color from colorless to pink or red, a base with a pH between the aforementioned pH values is present.
a pH indicator
This is a pH indicator.
Indicates whether the substance is an acid or alkali.
The pH range over which an indicator changes color.
change in pH, changes the colour (of the indicator)
you
Eriochrome Black T (protonated form) produce a complex with some metal ions.
transition interval
A universal indicator changes color in response to the pH of a liquid. Do determine the pH of the liquid, you need to refer to a color chart that tells you which color indicates which pH.
THe universal indicator is more accurate as it can detect different ranges in the pH, whereas phenolphthalein only changes at a ph of 8.0
An indicator
6.3x10-9