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Description
Methyl Red Indicator is a pH indicator used to detect acid production from glucose fermentation in in IMViC test by giving red color in bacterial media at pH4,4, when the result is negative it gives yellow colour at pH 6,2.
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Appearance
Pinkish red solution.
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Clarity
Clear without any particles.
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Reaction
Red at pH 4.4 and Yellow at pH 6.2 at 25 °C
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Compositions
Methyl red 0.200 gm, Ethyl alcohol 60.000 ml, Distilled water 40.000 ml
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Storage
Store between 10- 30°C.
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Additional description
A methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms — CH3. In formulas, the group is often abbreviated Me. Such hydrocarbon groups occur in many organic compounds. It is a very stable group in most molecules. While the methyl group is usually part of a larger molecule, it can be found on its own in any of three forms anion, cation or radical. The anion has eight valence electrons, the radical seven and the cation six. All three forms are highly reactive and rarely observed,
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Conjugation
red dye