49.0 MB (3.7 MB compressed)
3352 x 5106 pixels
28.4 x 43.2 cm ⏐ 11.2 x 17.0 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator. Universal indicator was added to three test tubes containing solutions with varying pH values, left to right: acidic (0.01M hydrochloric acid), pH=2; neutral (buffer solution), pH=7; alkaline (0.01M sodium hydroxide), pH=12. Universal indicator changes its colour depending on the pH of the solution.
Model release not required. Property release not required.