GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Editorial use only.
Methyl orange indicator. Methyl orange indicator changes its colour depending on the pH of the solution, it is red below 3.1 and yellow above 4.4. Here methyl orange (centre) is added to beakers with a acidic solution (left, 0.1 M hydrochloric acid, HCl) and an alkaline solution (right, 0.1 M sodium hydroxide, NaOH).
Model release not required. Property release not available.