GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Several indicators are added to acidic, neutral and alkaline solutions in a multiwell plate. The solutions are: 0.1 M hydrochloric acid (top row), neutral (pH=7) buffer (middle row), and 0.1 M sodium hydroxide. The indicators are, left to right columns: universal indicator, phenolphthalein, bromocresol purple, methyl orange.
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