Acid-base indicators

Acid-base indicators

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Acid-base indicators being compared in an acidic (along top) and alkaline (along bottom) solution. The indicators and the colour changes from acid to alkali are, from left to right: phenolphthalein (colourless-pink), methyl orange (red-yellow), and bromocresol green (yellow-blue). Alkalis and acids are the two sides of the pH scale, indicating the hydrogen ion concentration in a solution relative to that found in water. Alkalis contain less free hydrogen ions than water and acids contain more of these hydrogen ions. Water is considered neutral.

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Keywords: acid, acid-base, acidic, acidity, alkali, alkaline, alkalinity, analysis, analytical, apparatus, base, bromocresol green, change, chemical, chemistry, colour, comparing, comparison, demonstrating, demonstration, equipment, experiment, experimental, glassware, indicator, lab, laboratory, methyl orange, ph, phenolphthalein, reacting, reaction, test, testing

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