1. Carbohydrates Lab

2. Draw the following chart on a new sheet of paper:
Carbohydrate
Benedict’s Test
Positive or Negative
Iodine Test
Classification
(MONO, DI, POLY)
Honey (H)
Oats (O)
Table Sugar (T)
Apple Juice (A)

3. Key
Benedict’s Solution: Indicates the presence of glucose (monosaccharides only!)
Present = Reddish-brown (orange)
Not present = Remains blue (cloudy)
Iodine Solution: Indicates the presence of starch (polysaccharides only!)
Present = dark purple to black in color
Not Present = no color change

4. Questions: What 3 elements are present in all carbohydrates?
Describe the use of the root word “mono,” “di” and “poly” in classifying carbohydrates.
How can one determine by using Benedicts and Iodine if a sugar is:
Monosaccharide
Disaccharide
Polysaccharide
A certain sugar has no color change when tested with both Benedict’s & Iodine. What type of saccharide is it? Give an example of that type of sugar.
A certain sugar has a color change when tested with Benedicts but not Iodine. What type of saccharide is it? How do you know?