Question

Watch this video and complete this document as your lab report for Lab #4.

Video: https://youtu.be/sLP8dcnWnJg

4. Ethanol Emulsion Test is used to test for the presence of fats. A white emulsion represents a positive result. For each sample, type an “x” under the correct column.

Food Item	Positive Result	Negative Result
Fruit Juice
Egg Whites
Starch
Cooking Oil
Distilled Water

Questions:

1. Why was distilled water tested in each of the experiments?

2. For each one of these food items, predict the results. Write “positive” or “negative”.

Food Item	Starch Test	Biuret Test	Ethanol Emulsion Test
Potatoes
Skim Milk
Olive Oil
Beans

3. Using the Nutrition Facts Label on page 65 of your lab manual describe what each of the following would look like if this food item was tested:

1. Describe the Benedict’s test color:

2. Describe the Ethanol Emulsion test result:

3. Describe the Biuret test color:

4. Find any food item in your kitchen (do not use bottled water) and take a picture of the Nutrition Facts label. Describe what each of the following would look like if the food item of your choice was tested. Attach a picture of the label with your lab report.

1. Describe the Benedict’s test color:

2. Describe the Ethanol Emulsion test result:

3. Describe the Biuret test color:

Answer 1

Ethanol Emulsion Test is used to test for the presence of fats. A white emulsion represents a positive result. For each sample, type an “x” under the correct column. Food Item Positive Result Negative Result | Ethanol Emulsion test Fruit Juice is for presence of fat. Egg Whites Starch Cooking Oil Х Distilled Water CX X X

Distilled water is tested as a conrol or blank.

1. Describe the Benedict’s test color: Orange- brick red precipited

1. Describe the Ethanol Emulsion test result: White emulsion

1. Describe the Biuret test color: Purple