50.3 MB (4.0 MB compressed)
3416 x 5146 pixels
29.0 x 43.7 cm ⏐ 11.4 x 17.2 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Bromothymol blue indicator. Bromothymol blue indicator changes its colour depending on the pH of the solution. Here bromothymol blue has been added to three vials with an acidic solution (left, 0.1 M hydrochloric acid, HCl), a neutral solution (centre, pH=7 buffer), and an alkaline solution (right, 0.1 M sodium hydroxide, NaOH).
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