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What is the indicator and color change for a positive test for glucose?
Benedict solution is the chemical indicator for simple sugars.
What type of is saccharide has no change when tested with benidicts solution?
A monosaccharide like glucose would not change when tested with Benedict's solution. This is because Benedict's solution is used to test for the presence of reducing sugars, which monosaccharides like glucose are capable of reducing due to their open-chain form.
Why did the potato juice test negative in the benedict's reagent test?
The potato juice likely tested negative in the Benedict's reagent test because it does not contain reducing sugars, such as glucose or fructose, which are necessary to form a positive reaction with Benedict's reagent. Potatoes primarily consist of starch, a polysaccharide that is not a reducing sugar, explaining the negative test result.
Is glucose expected to have a positive iodine test?
Yes, glucose is expected to give a positive iodine test. Iodine reacts with glucose to form a blue-black color, indicating the presence of reducing sugars in the sample.
If a food that is tested with an iodine indicator turns dark blue then it contains?
If a food tested with an iodine indicator turns dark blue, it indicates the presence of starch. The iodine reacts with the starch molecules, forming a complex that results in the blue coloration. This test is commonly used to identify starch in various foods.
Why did a solution of saliva and oats test positive with benedict's test and iodine test if the oats alone tested positive only in the iodine test and the saliva alone was negative for both?
Saliva contains the enzyme amylase which breaks down starches in oats into simple sugars like glucose, which can then react with Benedict's solution to give a positive test result. The iodine test detects the presence of starch, which is in oats but not in saliva, explaining why the combination tested positive in both tests.
What substance is used to test for starch?
The presence of starch can be tested with the help of Iodine. Similarly Benedict's test solution is also used to detect the presence of starch.
Iodine and Benedict's solution were both used to test for certain nutrients in a sample of food If both tests were positive for the nutrients the sample must contain?
Both iodine and Benedict's solution test for different nutrients in the sample. Iodine is used to test for the presence of starch, while Benedict's solution is used to test for the presence of reducing sugars like glucose. Therefore, if both tests are positive, the sample must contain both starch and reducing sugars.
Does garlic have starch or sugar in it?
I am not sure about the sugars but I have tested Garlic for starch using the iodine test and it shows no sign of containing such. A Benedict's test can be done to determine if it contains sugars.
Is iodine an indicator of glucose?
Iodine is not an indicator of glucose. Iodine is primarily used as an indicator for the presence of starch in a solution through the formation of a blue-black color complex. Glucose can be tested using methods such as Benedict's solution, Fehling's solution, or glucose test strips.
What carbohydrate does not react with Iodine or Benedict's solution?
Sucrose
What is the difference between iodine solution and Benedict's solution?
Iodine solution is used to test for the presence of starch, turning blue-black in the presence of starch. Benedict's solution is used to test for reducing sugars such as glucose, turning from blue to brick red in the presence of reducing sugars.
Name a substance that can be tested for using iodine?
leaf
Iodine turns what colour when its positive for starch?
Iodine turns blue-black when it tests positive for starch due to the formation of a starch-iodine complex.
Stain used to tested for the starch molecules?
iodine ~jackie
What is starch tested for?
Iodine solution turns blue/black
Do proteins give positive iodine tests?
Yes, proteins can give a positive iodine test. When iodine reacts with proteins, it forms a complex that results in a brown color change, indicating a positive test for proteins.
