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==Key Stage 3==
===Meaning===
An '''indicator''' is a [[dye]] that changes [[colour]] depending on the when other [[pH]] of a [[solutionchemical]]s are present.
===About Indicators===
: Some [[indicator]]s detect [[pH]] but others can be used to detect other [[chemical]]s.Some non-pH '''indicators''' you should know:*[[Iodine Solution]] - Used to detect starch.*[[Biuret Solution]] - Used to detect proteins.*[[Benedict's Solution]] - Used to detect simple [[sugar]]s like [[glucose]]. ===About pH Indicators===: The [[colour]] of an a '''pH indicator''' can be used to tell the [[pH]] of a [[solution]].
: Different '''indicators''' will have a different range of colours for different [[pH]] values.
: A good '''indicator''' can be added to [[solution]] without affecting the [[pH]] of the [[solution]]. If an '''indicator''' change the [[pH]] of a [[solution]] it could not give an [[accurate]] [[reading]].
Some '''pH indicators''' you should know:
*[[Litmus Paper]]
*[[Red Cabbage Indicator]]