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This document lists and provides information about several natural pH indicators that could be used in a chemistry project, including bromocresol green, bromothymol blue, alizarin yellow GG, methyl orange, and phenolphthalein. For each indicator, it provides the approximate pH range where the color changes, the color in acid and base forms, and sometimes other identifying information like the type or pK value.
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varshith
- 18. bromothymol blue Also known as: 3',3''-dibromothymolsulfonephtalein Type: HIn + H2O In- + H3O+ pK: 7.30 Approximate pH range for color change: 6.0-7.6 Color of acid form: yellow Color of base form: blue
- 21. Approximate pH range for color change: 3.0-5.0 Color of acid form: blue Color of base form: red
- 22. Also known as: o-cresolsulfonephthalein Approximate pH range for color change: 0.0-1.0 Color of acid form: red Color of base form: yellow
- 23. crystal violet
- 26. Also known as: m-cresol purple, cresol purple, m- cresolsulfonephthalein pK: ~2.0 Approximate pH range for color change: 1.2-2.8 Color of acid form: red
- 27. Approximate pH range for color change: 0.2-1.8 Color of acid form: yellow Color of base form: blue
- 28. methyl orange Type: InH+ + H2O In + H3O+ pK: 3.46 Approximate pH range for color change: 3.1-4.4 Color of acid form: red Color of base form: orange-yellow
- 29. phenolphthalein Type: HIn + H2O In- + H3O+ pK: 9.5 Approximate pH range for color change: 8.0-9.8 Color of acid form: clear Color of base form: red-violet
- 30. quinaldine red Approximate pH range for color change: 1.0- 2.2 Color of acid form: clear Color of base form: red