Phenolphthalein
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Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in aci
Sample of solid phenolphthalein
Phenolphthalein in conc sulfuric acid
Phenolphthalein at p H 9
PH indicator
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A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually or spectroscopically by changes in absorption and/or emissio
Phenolphthalein
…Methyl orange pH indicator Thymolphthalexone…
pH measurement with indicator paper
Hydrangea in acid soil
Hydrangea in alkaline soil
A gradient of red cabbage extract pH indicator from acidic solution on the left to basic on the right