Phenolphthalein pH Indicator, 1 oz. For Sale
This 30ml (one ounce) container of phenolphthalein is often used as an acid-base indicator, with a pH range of 8.2 (colourless) to 10 (red). It comes in a handy squeeze bottle that allows you to dispense it by the drop. Our Phenolphthalein is in stock and will ship the following business day. Because of its low alcohol level, this one ounce size has no shipping restrictions and can be shipped by UPS overnight or 2-day air.
What exactly is an acid-base indicator?
A weak acid or a weak base is an acid-base indicator. Indicators have a highly important quality in that their colour changes depending on the pH of the solution in which they are placed. This colour shift does not occur at a set pH, but rather gradually throughout a range of pH values. The colour change interval refers to this range. A useful pH range is assigned to each pH indicator. Phenolphthalein, for example, changes colour from colourless at 8.2 to pink at 10. Furthermore, Bromthymol Blue has a good pH range of 6.0 (yellow) to 7.6 (blue).
How do liquid indicators work?
Other solutions are tested using liquid pH indicators. A few drops of the appropriate indicator applied to an unknown solution can reveal its pH value. Titration is a typical laboratory method in which chemists utilize pH indicators. An unknown ingredient is measured here by carefully adding a known concentration solution until a neutral point is attained. The colour shift of a pH indicator added into the unknown solution indicates the neutral point. In schools, the phenolphthalein pH indicator is utilized in a student activity that shows how a “infectious agent” spreads through a community.