SCIENCE PHOTO LIBRARY MOTION SCIENCE PHOTO LIBRARY MOTION
Universal indicator acid-base colour range. Footage of the colour range of universal indicator solution demonstrated in flasks containing liquids of different pH values. The acid-base (pH) scale runs from 0 to 14. The central flask here displays a neutral pH (7), while liquids in the flasks at left are acidic and in the flasks at right are alkaline (basic). The colours and approximate pH values are, from left to right: red (pH 1), orange (pH 3), yellow (pH 5), light green (pH 7), dark green (pH 9), light purple (pH 12), and dark purple (pH 14). For the full ranges of colours after full mixing has occurred, see clip K005/3824.
Model release not required. Property release not required.