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Universal indicator rainbow experiment

Universal indicator rainbow experiment

C010/9674

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Universal indicator rainbow experiment. Test tube showing a range of colours indicating a range of pH values. This colour banding is obtained using universal indicator, with a sodium carbonate crystal in the bottom of a test tube of water and acid at the top. This banding develops as the alkali (dark purple) and acid (red) meet. The neutral region is indicated by the narrow green band. Yellow is slightly acidic. This experiment can also be carried out using sodium hydroxide.

Release details

Model release not required. Property release not required.

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