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sulphuric acid acts as a dehydrating agent.all carbohydrates are dehydrated to give dehydration products. For example, pentoses give furfural as dehydration product where as hexoses give 5-hydroxy furfural.. these are attacked by 1-napthol to give a purple coloured condensation product...
Sulphuric acid is used in the Molisch test to dehydrate the carbohydrate present in the sample, forming furfural which then reacts with alpha-naphthol to produce a purple color. This color change is used as a positive indication for the presence of carbohydrates.
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What is the composition of molisch test?
Molisch test reagent is composed of alpha-naphthol dissolved in ethanol.
What is the importance of Molisch's test performed on carbohydrates?
Molisch's test is important for detecting the presence of carbohydrates in a solution. It involves the addition of alpha-naphthol and sulfuric acid, which react with the carbohydrates to form a purple color. This test is useful in biochemical and biological studies to identify the presence of sugars.
Why egg albumin gives the negative result for molisch test?
Egg albumin gives a negative result for the Molisch test because it does not contain carbohydrates. The Molisch test is used to detect the presence of carbohydrates, and since egg albumin consists mainly of proteins with little to no carbohydrates, it does not react with the reagents used in the Molisch test to give a positive result.
What will happened if Hydrochloric acid is used instead of sulfuric acid in molisch test?
Using hydrochloric acid instead of sulfuric acid in the Molisch test would yield a different result. Hydrochloric acid does not have the same dehydrating properties as sulfuric acid, so it would not lead to the formation of a purple ring with carbohydrates. The Molisch test relies on the dehydrating ability of sulfuric acid to break down carbohydrates into simpler compounds, which then react with alpha-naphthol to produce the purple ring.
Why purple colour give in Molisch test?
The purple color in the Molisch test is due to the formation of a complex between the carbohydrate present in the sample and the alpha-naphthol reagent used in the test. This complex formation indicates the presence of carbohydrates in the sample.
What is the composition of molisch test?
Molisch test reagent is composed of alpha-naphthol dissolved in ethanol.
What is the purpose of Molisch's test?
Molisch's Test (named after Austrian botanist Hans Molisch) is a sensitive chemical test for the presence of carbohydrates, based on the dehydration of the carbohydrate by sulfuric acid to produce an aldehyde, which condenses with two molecules of phenol (usually α-naphthol, though other phenols (e.g. resorcinol, thymol) also give colored products) resulting in a red- or purple-colored compound.
What is molisch?
Molisch's Test refers to a chemical test used to test for carbohydrate existence. This is done using carbohydrate dehydration with hydrochloric or sulfuric acid to create aldehydes. These condense a couple phenol molecules to produce purple or red compounds.
What is the importance of Molisch's test performed on carbohydrates?
Molisch's test is important for detecting the presence of carbohydrates in a solution. It involves the addition of alpha-naphthol and sulfuric acid, which react with the carbohydrates to form a purple color. This test is useful in biochemical and biological studies to identify the presence of sugars.
What is the positive result for molisch test?
all carbohydrates show positive result to Molisch test. this is because Molisch test is used to distinguish carbohydrates from other organic compound.
Why egg albumin gives the negative result for molisch test?
Egg albumin gives a negative result for the Molisch test because it does not contain carbohydrates. The Molisch test is used to detect the presence of carbohydrates, and since egg albumin consists mainly of proteins with little to no carbohydrates, it does not react with the reagents used in the Molisch test to give a positive result.
Viva voce for molisch test?
The Molisch test is used to detect the presence of carbohydrates in a given sample. During a viva voce for the Molisch test, you may be asked to explain the principle of the test, demonstrate how it is performed, and interpret the results obtained. Be prepared to discuss the formation of a purple ring when positive for carbohydrates due to the reaction between α-naphthol and sulfuric acid.
What is the general test used for carbohydrates?
i think the general test for carbohydrates is Molisch Test..
What will happened if Hydrochloric acid is used instead of sulfuric acid in molisch test?
Using hydrochloric acid instead of sulfuric acid in the Molisch test would yield a different result. Hydrochloric acid does not have the same dehydrating properties as sulfuric acid, so it would not lead to the formation of a purple ring with carbohydrates. The Molisch test relies on the dehydrating ability of sulfuric acid to break down carbohydrates into simpler compounds, which then react with alpha-naphthol to produce the purple ring.
What is the action of sulphuric acid on red litmus?
Blue litmus is used to test acidic solutions.
Why is sulphuric acid not used in preparation of carbondioxidei?
because sulphuric acid stops reaction
That are the reactions in molisch tesr?
Molisch test is a qualitative chemical test used to detect the presence of carbohydrates. The reaction involves the reaction between the carbohydrate and concentrated sulfuric acid, resulting in the formation of a violet or purple color. This color change is due to the dehydration of the carbohydrate and the subsequent formation of furfural compounds.
