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Difference between revisions of "Indicator (Chemistry)"
 
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==Key Stage 3==
 
==Key Stage 3==
 
===Meaning===
 
===Meaning===
−
An '''indicator''' is a [[dye]] that changes [[colour]] depending on the [[pH]] of a [[solution]].
+
An '''indicator''' is a [[dye]] that changes [[colour]] when other [[chemical]]s are present.
  
 
===About Indicators===
 
===About Indicators===
−
: The [[colour]] of an '''indicator''' can be used to tell the [[pH]] of a [[solution]].
+
: Some '''indicators''' 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 Test|Benedict's Solution]] - Used to detect simple [[sugar]]s like [[glucose]].
 +
*[[Limewater]] - Used to detect [[Carbon Dioxide]].
 +
 
 +
===About pH Indicators===
 +
: 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.
 
: 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]].
 
: 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]]
 +
*[[Universal Indicator]]
 +
*[[Phenolphthalein]]
 +
*[[Methyl Orange]]
 +
*[[Bromothymol Blue]]
  
 
===Examples===
 
===Examples===
 +
{| class="wikitable"
 +
|+ These are the colour ranges of different '''indicator''' plants.
 +
|-
 +
|[[File:NaturalIndicators.png|center|600px]]
 +
|-
 +
|}
 +
 +
==Key Stage 4==
 +
===Meaning===
 +
An '''indicator''' is a [[dye]] that changes [[colour]] when other [[chemical]]s are present.
  
 +
===About Indicators===
 +
: Some '''indicators''' 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 Test|Benedict's Solution]] - Used to detect simple [[sugar]]s like [[glucose]].
 +
*[[Limewater]] - Used to detect [[Carbon Dioxide]].
 +
 +
===About pH Indicators===
 +
: 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 '''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]]
 +
*[[Universal Indicator]]
 +
*[[Phenolphthalein]]
 +
*[[Methyl Orange]]
 +
*[[Bromothymol Blue]]
 +
 +
===Examples===
 
{| class="wikitable"
 
{| class="wikitable"
 
|+ These are the colour ranges of different '''indicator''' plants.
 
|+ These are the colour ranges of different '''indicator''' plants.
Line 16: Line 62:
 
|-
 
|-
 
|}
 
|}
 +
 +
===References===
 +
====Edexcel====
 +
 +
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Indicators (pH) page 52, GCSE Chemistry, Pearson, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Indicators (pH), page 196, GCSE Combined Science, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Indicators, page 43, 65, 110, GCSE Chemistry; The Revision Guide, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Indicators, pages 105, 209, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Indicators, pages 118-120, 131, 132, 185, 186, 205, 323, GCSE Chemistry, CGP, Edexcel '']
 +
 +
====OCR====
 +
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Indicators, pages 112, 114, 220, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Indicators, pages 43, 64, 81, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Indicators, pH, pages 112, 113, 119, 166, 199, 275, Gateway GCSE Chemistry, Oxford, OCR '']

Latest revision as of 14:42, 13 December 2019

Key Stage 3

Meaning

An indicator is a dye that changes colour when other chemicals are present.

About Indicators

Some indicators detect pH but others can be used to detect other chemicals.

Some non-pH indicators you should know:

About pH Indicators

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 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:

Examples

These are the colour ranges of different indicator plants.
NaturalIndicators.png

Key Stage 4

Meaning

An indicator is a dye that changes colour when other chemicals are present.

About Indicators

Some indicators detect pH but others can be used to detect other chemicals.

Some non-pH indicators you should know:

About pH Indicators

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 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:

Examples

These are the colour ranges of different indicator plants.
NaturalIndicators.png

References

Edexcel

Indicators (pH) page 52, GCSE Chemistry, Pearson, Edexcel
Indicators (pH), page 196, GCSE Combined Science, Pearson Edexcel
Indicators, page 43, 65, 110, GCSE Chemistry; The Revision Guide, CGP, Edexcel
Indicators, pages 105, 209, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Indicators, pages 118-120, 131, 132, 185, 186, 205, 323, GCSE Chemistry, CGP, Edexcel

OCR

Indicators, pages 112, 114, 220, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Indicators, pages 43, 64, 81, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR
Indicators, pH, pages 112, 113, 119, 166, 199, 275, Gateway GCSE Chemistry, Oxford, OCR
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