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The melting point of alpha naphthol is 95-96 oC.
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∙ 6y ago
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Why you dissolve absolute ethanol in 5 percent alpha naphthol for the Molisch test?
Alpha naphthol is used in the Molisch test to detect the presence of carbohydrates. Dissolving absolute ethanol in a 5 percent alpha naphthol solution helps to enhance the reaction and improve the sensitivity of detecting carbohydrates. The ethanol acts as a solvent to dissolve the alpha naphthol and create a reagent that can easily react with the carbohydrates in the test sample.
The temperature at which a solid melts is called?
melting point
What compounds other than a-napthol can be used as a reagent for the test?
the compounds other than alpha-naphthol can be used as a reagent for the Molisch's test are the love formula.
What is difference between melting point and drop melting point?
No basic Difference between melting point and Drop point.
What becomes solid above the melting point?
assuming it is its own melting point NOTHING which is why its a MELTING point
What is the melting point of phenyl-azo beta-naphthol?
The melting point of phenylazo- beta-naphthol is somewhere from 131 to 133 degrees Celsius. Phenylazo- beta-naphthol is also called as Sudan I.
What is the difference between alpha and beta naphthol?
alpha naphthol with CCl4(carbon tetrachloride) gives blue colour whereas beta naphthol with CCl4 gives no colour. that is the distinction test between alpha and beta naphthol.
What is the melting point of fifty percent 2-naphthol and fifty percent benzoic acid?
90-94 degrees celsius
What would happen to the melting point of pure benzoic acid if 2-naphthol was mixed in?
The literature value of the melting point of pure benzoic acid is about 122.4 degrees Celsius, while the literature value of the melting point of pure 2-naphthol is close at 122 degrees Celsius. Nevertheless, the melting point of the benzoic acid should be depressed (go down) compared to the literature value if you were to add 2-naphthol because the sample you were testing would then be impure, even if that impurity does have a similar melting point. Also, the range over which the sample melts should get larger as well. Instead of melting within a degree or less, it may melt over the course of several degrees. So I just tested this in lab, and I can't promise that this is 50/50, but my melting point for 2-naphthol with Benzoic acid is 104.1-106.0 degrees Celsius This is a very basic answer, and the trend is true. However, with my organic chemistry professor, this answer would be followed by a blank look and "Why?" The best way to think of this is to look at the chemical structure of Benzoic Acid and 2-naphthol separate. Go ahead and Google it on a new tab. Now look at the molecule of the two together. And think: "What does the composite molecule have that the two alone don't?" Give up? Electronegativity. The more electronegative a molecule is the greater its reactivity. As in the compound molecule will melt easier than the two 'pure' substances.
Why fructose give intense violet coloration with alpha naphthol in acidic media?
when it is kept in acid media,the acid hydrolyses the glycosidic bond and yields monosaccharide to give furfural and its derivatives ,these products when react with alpha naphthol (sulphonated) they give a purple complex
How could you seperate benzophenone from a-naphthol?
The melting point for lauric acid is about 45 degrees while it is 121 degrees for naphthol. So, in a mixture repeated cycles of slow warming and cooling should separate out lauric acid from naphthol. You can improve the efficiency by adding a dash of slightly acidic 70% isopropyl alcohol. This will deprotonate the lauric acid while maintaining the proton on naphthol during this process to enhance separation and purification of the two compounds. You could also flat-out distill the two products by maintaining the temperature of the solution at the boiling point of lauric acid to separate it from naphthol.
What do you call the temperature at which a solid changes to a liquid?
This is the melting point.
Why you dissolve absolute ethanol in 5 percent alpha naphthol for the Molisch test?
Alpha naphthol is used in the Molisch test to detect the presence of carbohydrates. Dissolving absolute ethanol in a 5 percent alpha naphthol solution helps to enhance the reaction and improve the sensitivity of detecting carbohydrates. The ethanol acts as a solvent to dissolve the alpha naphthol and create a reagent that can easily react with the carbohydrates in the test sample.
Which term is defined as the temperature at which a substance changes from a solid to a liquid state?
melting point
The temperature at which a solid melts is called?
melting point
What compounds other than a-napthol can be used as a reagent for the test?
the compounds other than alpha-naphthol can be used as a reagent for the Molisch's test are the love formula.
What is difference between melting point and drop melting point?
No basic Difference between melting point and Drop point.
