49.2 MB (3.4 MB compressed)
3361 x 5117 pixels
28.4 x 43.4 cm ⏐ 11.2 x 17.1 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator. Universal indicator was added to two test tubes containing sodium hydroxide solutions of different concentrations, resulting in different pH values. Left: pH=9 (weak base), right: pH=12 (strong base). Universal indicator changes its colour depending on the pH of the solution.
Model release not required. Property release not required.