Question

lynn performed the benedict test on water (tube a) and three samples of variable simple sugar concentration (tubes b, c, d). which of the following best explains the experimental results observed in tube a? a b c d tube a was contaminated by the contents of one of the other tubes. benedict reagent was not added to tube a.

Explanation:

The Benedict's test is used to detect reducing sugars. Water does not contain reducing sugars and should not give a positive - colored reaction if the test is performed correctly. If Tube A shows a color similar to the tubes with sugar, it is likely contaminated by the sugar - containing solutions in other tubes. If the reagent was not added, Tube A would remain colorless (assuming water was the only content initially).

Answer:

Tube A was contaminated by the contents of one of the other tubes.