Phenolphthalein changes from colorless to pink in the range of pH 8.2 - 10. If toothpaste has a pH that is below this range, phenolphthalein will not indicate the basicity. if the pH is higher, which I believe it is in most (some) toothpastes, then phenolphthalein can be used, because it will turn from colorless to pink.
make it useful for testing for signs of carbonation reactions in concrete
This base may be sodium hydroxide (NaOH).
A base
Toothpaste does not have acid in it, Toothpaste is an Alkalie.
Crest toothpaste is an acid.
its a base
base
it a base
NEUTRAL
The active ingredient of toothpaste is fluorine ions, which is not a base. Although there may be basic compounds added to toothpaste in order to make it a unique product according to the brands.
Yellow because toothpaste is base
toothpaste contains a weak base called hydroxyle because it helps to neutralize and to remove acid in mouth with the PH of 8 called a weak base