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43.7 x 29.2 cm ⏐ 17.2 x 11.5 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, it is yellow below 6.0 and blue above 7.6. Here bromothymol blue has been added to vials with an acidic solution (left, 0.1 M hydrochloric acid, HCl) and an alkaline solution (right, 0.1 M sodium hydroxide, NaOH).
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