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The protonated form of bromothymol blue has its peak absorption at 427 nm thus transmitting yellow light in acidic solutions, while the deprotonated form has its peak absorption at 602 nm thus transmitting blue light in more basic solutions. [3] In contrast, highly acidic bromothymol blue is magenta in color.
Bromothymol blue: yellow 6.0 7.6 blue Phenol red: yellow 6.4 8.0 red Neutral red: red 6.8 8.0 yellow Naphtholphthalein: pale red 7.3 8.7 greenish-blue Cresol red: yellow 7.2 8.8 reddish-purple Cresolphthalein: colorless 8.2 9.8 purple Phenolphthalein (first transition) colorless 8.3 10.0 purple-pink Phenolphthalein (second transition) purple ...
Solution: The main components of a universal indicator, in the form of a solution, are thymol blue, methyl red, bromothymol blue, and phenolphthalein. This mixture is important because each component loses or gains protons depending upon the acidity or alkalinity of the solution being tested. It is beneficial to use this type of universal ...
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The Sigma-Aldrich catalog lists the pKa value of 7.10 as approximate. (The quoted description from the online catalog is: Bromothymol Blue (BTB) is a pH indicator (pKa approx. 7.1) that is used as a biological slide vital stain to define cell walls or nuclei under the microscope.
Light yellowish pink [6]? ? ? Methamphetamine: Substance Deep reddish orange/Dark reddish brown [6] No reaction ? Blue Methaqualone: Substance No reaction No reaction ? No reaction Methoxetamine: Substance Pink (slow) Yellow > green > red ? Slow pink > red Methylone [1] Substance Brown Orange/brown ? Blue Methylphenidate: Substance Moderate ...
Phenolphthalein's common use is as an indicator in acid-base titrations. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue. [3] Phenolphthalein adopts different forms in aqueous solution depending on the pH of the solution.
The standards used include potassium dichromate (isosbestic points at 339 and 445 nm), bromothymol blue (325 and 498 nm) and congo red (541 nm). The wavelength of the isosbestic point determined does not depend on the concentration of the substance used, and so it becomes a very reliable reference.
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