For all practical purposes, therefore, Prunoids are phenolphthalein.
Mix the saccharin with the tincture of vanilla, and incorporate the phenolphthalein.
When dark colored oils or fats are being titrated it is often difficult to obtain a good end point with phenolphthalein.
phenolphthalein as shown above is not a good indicator for this purpose.
The first page mentioned discusses the introduction of phenolphthalein into medicine.
The resulting reaction is expressed as % acid or alkaline to phenolphthalein.
If only perfectly fresh milk is used, the amount of acid will generally be about 0.15 per cent with phenolphthalein as indicator.
Note:—The potassium oxalate and the formalin must both be neutral to phenolphthalein.
The diluted solution is acid in reaction toward litmus and phenolphthalein and alkaline toward methyl orange.
Litmus is insensitive to many weak organic acids the presence of which is readily indicated by phenolphthalein.
phenolphthalein phe·nol·phthal·ein (fē'nōl-thāl'ēn', -thāl'ē-ĭn, -thā'lēn', -thā'lē-ĭn)
A white or pale yellow crystalline powder that is used as an acid-base indicator and as a laxative.
A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. In solutions that are either neutral or basic, it is colorless, while it is pink or red in solutions that are alkali. It is also used as a laxative and in making dyes. Chemical formula: C20H14O4.