GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Adding potassium hydroxide to water, 2 of 4. Potassium hydroxide (KOH), 0.1 M concentration, is poured into a beaker that contains water with few drops of phenolphthalein indicator added. Water turns progressively pink as the solutions become alkaline throughout the volume.
Model release not required. Property release not required.