Rosolic Acid
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Rosolic acid (also known as aurin or corallin) is a mixture of trihydroxytriphenylmethane derivatives used as an indicator in acidimetry. The article describes its chemical composition, preparation as an indicator solution, and its pH transition range.
Encyclopedia entry (1928–1936)
ROSOLIC ACID (aurin, corallin), a mixture of trihydroxytriphenylmethane derivatives, the main component of which is rosolic acid pseudo- xc6h4oh O = C6H4 = C<(
. It is used as an indicator (see) in the form of a 0.5% solution in diluted alcohol (2.5 g of rosolic acid is dissolved in 250 cm3 of alcohol and diluted with water to a volume of 500 cm3). The transition zone of rosolic acid lies at pH 6.9-8.0, changing from red to yellow. Rosolic acid is particularly useful in the acidimetry of alcoholic liquids. For 10 cm3 of the titrated liquid, 1-3 drops of the indicator solution are taken.
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Cite this page
“Rosolic Acid.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/rosolic-acid/