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Acid-base indicators

Acid-base indicators

A500/0439

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY 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.

Release details

Model release not required. Property release not required.

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