-
Thymolphthalein is a
phthalein dye used as an acid–base (pH) indicator. Its
transition range is
around pH 9.3–10.5.
Below this pH, it is colorless; above...
-
eventually disappear again because of the
reaction with
carbon dioxide.
Thymolphthalein is used for the same
purpose and in the same way, when a blue color...
-
Phenolphthalein Phenolsulfonphthalein Tetrabromophenolphthalein Thymol blue
Thymolphthalein Xylenolphthalein Triarylmethane dye Sabnis, Ram W. (2010). "Phthalein...
- rely on the
chemical reaction between thymolphthalein and a
basic substance such as
sodium hydroxide.
Thymolphthalein,
which is
normally colorless, turns...
-
several triarylmethane and
xanthene dyes.
Examples are the
synthesis of
thymolphthalein (a pH indicator) from two
equivalents of
thymol and
phthalic anhydride:...
- red,
including bromothymol blue,
thymol blue,
bromocresol purple,
thymolphthalein, and phenolphthalein. (A
table of
other common chemical indicators...
- water. This
allows the use of
indicators such as
phenolphthalein or
thymolphthalein (with
alkaline colour changes)
without the risk of
titration errors...
- it
becomes intensely violet.
Other examples are
phenolphthalein and
thymolphthalein,
colorless in
acidic to
neutral pH, but
becoming pink and blue in alkaline...
- Red Blue 3.0 - 5.2 Red
Phenolphthalein Colourless 8.3 - 10.0 Pink
Thymolphthalein Colourless 9.3 - 10.5 Blue
Bromophenol Blue
Yellow 3.0 - 4.6 Blue Bromocresol...
-
Phenolphthalein (second transition) purple-pink 12.0 13.0
colorless Thymolphthalein colorless 9.3 10.5 blue
Alizarine Yellow R
yellow 10.2 12.0 red Indigo...
