Iodine tests for the presence of starch. It is brownish yellow in color if there is no starch present, and bluish black if starch is present.
Benedict's solution is used to test for the presence of a reducing sugar, changing from its usual color blue to green to brick red if reducing sugars are present. No reducing sugar solution stays blue.
Perhaps the iodine solution was old and gave a false negative.
Iodine test is a procedure that tells whether a certain element or the such contains starch (or sugar) in it.In this test, we add iodine solution (with, possibly, KI reagent) to a material [in your case, sugar]. If starch ispresent, a blue-black, somehow purple, color will result, changing the initial color of iodine. If starch amylase (sugar) is NOT present, the color will remain orange/yellowish.
Starch
The Iodine test is used to test for the presence of starch.
Benedict's solution is used to test for simple sugars and iodine is used to test for starches.
A negative Benedict's test would indicate that there isn't any presence of reducing sugars in that particular substance.
The iodine test will detect the presence of starch in the endosperm.
benedicts test
The Qualitative tests for each of the macronutrients are as follows: Carbohydrates - Iodine test and/or Benedicts test Proteins - Biuret test Fats - Ethanol (Emulsion) test
If you're using iodine, a negative test will be the color of the iodine solution, which should be a brownish color.
benedicts test
yes
simple sugars- benedicts starches- iodine protein- biuret lipid- brown paper bag test
penis
Perhaps the iodine solution was old and gave a false negative.
prosrdure of benidect solution test
Iodine test is a procedure that tells whether a certain element or the such contains starch (or sugar) in it.In this test, we add iodine solution (with, possibly, KI reagent) to a material [in your case, sugar]. If starch ispresent, a blue-black, somehow purple, color will result, changing the initial color of iodine. If starch amylase (sugar) is NOT present, the color will remain orange/yellowish.