Cresol Red CAS #1733-12-6

1. Physical properties
The appearance is dark red crystalline powder. It has a metallic luster. It is slightly soluble in water and ethanol, easily soluble in alkaline solutions and is red, and in acidic solutions it is yellow.
2. Chemical properties
The pH value is 0.2 (yellow) ~ 1.8 (red); 7.2 (yellow) ~ 8.8 (red).
That is, under different pH environments, cresol red will show different colors, and can be used to indicate the end point of the reaction in experiments such as acid-base titration.
It is relatively stable to light and heat, but it should be avoided from long-term exposure to strong light and high temperature environments to avoid affecting its indicating performance.
3. Uses
As an acid-base indicator, it is widely used in chemical analysis, titration experiments and other fields.
It is used to detect changes in the pH of the solution to help experimenters accurately judge the progress of the reaction.
In some medical tests, it can be used to detect the pH of body fluids and provide a reference for disease diagnosis.
It can also be used in some industrial production processes to monitor and control the pH of the solution.