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: The [[colour]] of 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 '''pH indicator''' can be added to [[solution]] without affecting the [[pH]] of the [[solution]]. If an a '''pH indicator''' change changed the [[pH]] of a [[solution]] it could not give an [[accurate]] [[reading]].
Some '''pH indicators''' you should know:
*[[Litmus Paper]]
{| class="wikitable"
|+ These are the colour ranges of different '''pH indicator''' plants.
|-
|[[File:NaturalIndicators.png|center|600px]]
|-
|}
==Key Stage 4==
===Meaning===
A '''pH indicator''' is a [[dye]] which changes colour depending on the [[concentration]] of [[Hydrogen Ion (Chemistry)|H<sup>+</sup>]] or [[Hydroxide Ion (Chemistry)|OH<sup>-</sup> ions]] in [[solution]].
===About pH Indicators===
: '''pH indicators''' are used to determine the [[pH]] of a [[solution]].
: Different '''pH indicators''' have a different range of effectiveness. Some only have two colours and change between them at a very specific [[pH]]. Others can have many different colours over a range of [[pH]] values.
{| class="wikitable"
|+ These are the colour ranges of some common pH indicators.
|-
|[[File:pHIndicators.png|center|600px]]
|}