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INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper.

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Presentation on theme: "INDICATORS in chemistry and everyday life. INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper."— Presentation transcript:

1 INDICATORS in chemistry and everyday life

2 INDICATORS SUMMARY Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper

3 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. 123

4 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

5 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 125

6 INDICATORS 126

7 INDICATORS 127 Bromothymol blue is the most famous coloured indicator

8 INDICATORS C : pH in transition range of BBT 128 A : acid form of BBT B : basic form of BBT

9 INDICATORS We can find a lot of natural indicators in the nature : Red cabbage (red–pink–violet–blue–green–yellow) - Turmeric / Curry (yellow-orange-brown) - Tea (yellow-brown) - Rose petals (blue-pink) - Artichoke (colorless-yellow) - …

10 INDICATORS pH paper (Hydrion Paper) is a paper which contains a Universal Indicator 1210 "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

11 INDICATORS 1211 Thank you for having listened us…


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