Question

3. Complete the table below. For each test, indicate what you will observe if the test is positive. Then state what a positive test will tell you about each of the carbohydrates you are testing. test expected observation for a positive test substance indicated by a positive test Ca) (b) potassium iodide/iodine (KI/1.) starch test Benedict's test (e) Bial's test 79

Answer 1

3. Complete the table below. For each test, indicate what you will observe if the test is positive. Then state what a positive test will tell you about each of the carbohydrates you are testing. test expected observation for a positive test substance indicated by a positive test (a) (b) potassium iodide/iodine (KI/I.) starch test blue black starch Benedict's test (c) brick red ppt (d) reducing sugars Bial's test (e) blue (A pentoses

Iodine is yellow in colour. It is used to detect the presence of starch in a medium. It turns blue black in the presence of starch.

Benedict reagent is a blue coloured reagent. It is used to detect the presence of reducing Sugars like glucose and sucrose. It gives a brick red precipitate when heated in the presence of these sugars.

Bial's reagent is a yellowish reagent. It is used to detect the presence of pentoses with which it gives a bluish colour.

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