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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]]
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Indicators (of pH), page 289, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Indicators (of pH), page 369, GCSE Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Indicators, page 126, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Indicators, page 52, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Indicators, pages 124, 125, 237, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe09996 ''Indicators, pages 128, 134, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 ''Indicators, pages 146, 147, 149, 150, 315, GCSE Chemistry, CGP, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''pH indicators, page 317, GCSE Biology, CGP, Edexcel '']