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INDICATORS - PowerPoint PPT Presentation

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INDICATORS
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  1. pH INDICATORS in chemistry and everyday life

  2. pH INDICATORS 2 12 SUMMARY 1. 2. 3. 4. 5. 6. Introduction Definition of pH Acids and bases Bromothymol blue Natural indicators pH paper SUMMARY

  3. pH INDICATORS 3 12 INTRODUCTION 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.

  4. pH INDICATORS 4 12 pH is a mathematic tool used in chemistry to measure acidity of a solution mathematic definition for diluted solutions : DEFINITION OF pH usual pH range : 0-14

  5. pH INDICATORS 5 12 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 ACIDS & BASES

  6. pH INDICATORS 6 12 ACIDS & BASES

  7. pH INDICATORS 7 12 Bromothymol blue is the most famous coloured indicator BROMOTHYMOL BLUE

  8. pH INDICATORS 8 12 BROMOTHYMOL BLUE A : acid form of BBT B : basic form of BBT C : pH in transition range of BBT

  9. pH INDICATORS 9 12 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) • … NATURAL INDICATORS

  10. pH INDICATORS 10 12 pH paper (Hydrion Paper) is a paper which contains a Universal Indicator "Universal Indicator" means severals indicators mixed in order to emit a different color for each pH value pH PAPER acidic basic pH paper is red in acid solutions and purple in basic solutions

  11. pH INDICATORS 11 12 Thank you for having listened us… pH INDICATORS