This 3.8L (one gallon) bottle of phenolphthalein is a 1% solution in ethanol. Commonly used as an acid-base indicator, 8.2 (colorless) - 10 (red). Our phenolphthalein is made fresh when ordered.
Our 3.8L size Phenolphthalein has flammable contents and only ships within the contiguous US states • No air deliveries allowed
What is an acid-base indicator?
An acid-base indicator is a weak acid or a weak base. Indicators have a very useful property - they change color depending on the pH of the solution they are in. This color change is not at a fixed pH, but rather, it occurs gradually over a range of pH values. This range is termed the color change interval. Each pH indicator is defined by a useful pH range. For example phenolphthalein changes from colorless at 8.2 to pink at 10.
How are liquid indicators used?
Liquid pH indicators are used to test other solutions. A few drops of the right indicator added to an unknown solution can tell you its pH value. Chemists use pH indicators in a common laboratory procedure called titration. Here, an unknown substance is measured by carefully adding a solution of known concentration until a neutral point is reached. The neutral point is indicated by the color change of a pH indicator mixed in with the unknown solution. In schools, phenolphthalein pH indicator is used in a student activity demonstrating first hand how an “infectious agent” is transmitted through a population.
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