General description
Phenolphthalein is an indicator for acid-base titration reactions. It changes from colorless to violet-red between pH 8.3-9.8, it is red in extremely acidic solutions, and colorless in extremely alkaline solutions.
It is present as a nonionic, lipophilic lactone in aqueous neutral solutions. It exists as a hydrophilic dianion in alkaline solutions.
Application
Phenolphthalein has been commonly used as an indicator in the fields of biology and medicine. Its applications include:
- the development of novel technique to monitor the vacuum freeze-drying process
- the determination of the depth of carbonation in concrete
- the utilization of liquid marbles to sense gaseous environmental components
- the estimation of total acidity in vinegar
- the assessment of sodium hydroxide penetration into potatoes following chemical peeling
- as a model organic compound in the evaluation of the capture efficiency of various cyclodextrin constructs such as nanofiber-CD
Biochem/physiol Actions
Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions.
Principle
Phenolphthalein undergoes structural modification when there is a change in pH or in the structural state of water. It is a nonionic, lipophilic colorless lactone in aqueous neutral solutions and a hydrophilic dianion in alkaline solutions.
- UPC:
- 51171623
- Condition:
- New
- Weight:
- 1.00 Ounces
- HazmatClass:
- No
- WeightUOM:
- LB
- MPN:
- 105945-2.5KG
