A universal indicator is a blend of pH indicator solutions designed to
identify pH of a solution over a wide range of values. There are several
different formulas for universal indicators, but most are based on a
patented formula developed in 1933 by Yamada. A common mixture includes
thymol blue, methyl red, bromothymol blue, and phenolphthalein.
Color change is used to identify pH values. The most common universal indicator colors are:
Red 0 ≥ pH ≥ 3
Yellow 3 ≥ pH ≥ 6
Green pH = 7
Blue 8 ≥ pH ≥ 11
Purple 11 ≥ pH ≥ 14
However, the colors are specific to the formulation. A commercial
preparation comes with a color chart that explains the expected colors
and pH ranges.
While a universal indicator solution may be used to test any sample, it
works best on a clear solution because it's easier to see and interpret
the color change.
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identify pH of a solution over a wide range of values. There are several
different formulas for universal indicators, but most are based on a
patented formula developed in 1933 by Yamada. A common mixture includes
thymol blue, methyl red, bromothymol blue, and phenolphthalein.
Color change is used to identify pH values. The most common universal indicator colors are:
Red 0 ≥ pH ≥ 3
Yellow 3 ≥ pH ≥ 6
Green pH = 7
Blue 8 ≥ pH ≥ 11
Purple 11 ≥ pH ≥ 14
However, the colors are specific to the formulation. A commercial
preparation comes with a color chart that explains the expected colors
and pH ranges.
While a universal indicator solution may be used to test any sample, it
works best on a clear solution because it's easier to see and interpret
the color change.
https://www.geezgo.com/sps/44200
Join
Geezgo for free. Use Geezgo's end-to-end encrypted Chat with your
Closenets (friends, relatives, colleague etc) in personalized ways.>>
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