INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids...
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Transcript of INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids...
![Page 1: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/1.jpg)
INDICATORSin chemistry and everyday life
![Page 2: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/2.jpg)
INDICATORS
SUMMARY
Introduction
Definition of pH
Acids and bases
Bromothymol blue
Natural indicators
pH paper
1.
2.
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![Page 3: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/3.jpg)
INDICATORS
A pH indicator is a halochromic chemical
compound that is added in small amounts to a solution
in order to determinate easily the pH (acidity or
alkalinity) of the solution.
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INDICATORS 124
pH is a mathematic tool used in chemistry to measure acidity of a solution
mathematic definition for diluted solutions :
usual pH range : 0-14
![Page 5: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/5.jpg)
INDICATORS
pH indicators exist under severals forms of acide-base couples :
InH in acidic solutions (1st colour)In- in basic solutions (2nd colour)
-> So, the colour of the solution can give us informations about acidity of the solution
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![Page 6: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/6.jpg)
INDICATORS 126
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INDICATORS 127
Bromothymol blue is the most famous coloured indicator
![Page 8: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/8.jpg)
INDICATORS
C : pH in transition range of BBT
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A : acid form of BBT
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
350
370
390
410
430
450
470
490
510
530
550
570
590
610
630
650
Wavelenght (nm)
Ab
sorb
ance A
B
C
B : basic form of BBT
![Page 9: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/9.jpg)
INDICATORS
We can find a lot of natural indicators in the nature :
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- Red cabbage (red–pink–violet–blue–green–yellow)- Turmeric / Curry (yellow-orange-brown)- Tea (yellow-brown)- Rose petals (blue-pink)- Artichoke (colorless-yellow)- …
![Page 10: INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.](https://reader031.fdocuments.us/reader031/viewer/2022032701/56649c6e5503460f94920a81/html5/thumbnails/10.jpg)
INDICATORS
pH paper (Hydrion Paper) is a paper which contains a Universal Indicator
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"Universal Indicator" means severals indicators mixed in order to emit a different color for each pH value
pH paper is red in acid solutions and purple in basic solutions
acidic basic
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INDICATORS 1211
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