Lab Report 4: Identifying Unknown Foods 1
Lab Report 4: Identifying Unknown Foods
Manager Recorder Lab Tech Computer Tech
1a. Complete the following summary tables for the 5 biochemical tests performed in this
experiment.
• Write in the blank the category of substance being tested for.
• Indicate what was used as the negative/ positive controls.
• Record your results indicating presence or absence of the substance being tested. Test 1: Sudan III Test for Final Color Interpretation of Results
Negative control: Positive control:
Test 2: Benedict’s Test for Final Color Interpretation of Results
Negative control: Positive control:
Test 3: Iodine Test for Final Color Interpretation of Results
Negative control: Positive control:
Test 4: Biuret Test for Final Color Interpretation of Results
Negative control: Positive control:
Test 5: Silver Nitrate Test for Final Color Interpretation of Results
Negative control: Positive control: 1b. The Benedict’s Test is quantitative. Explain. 1c. Which test must be boiled before the results can be recorded?
1d. Name a test result based on solubility.
2 Lab Report 4: Identifying Unknown Foods
2a. Team’s unknown # Complete the table by indicating the identity of the unknown and results (positive or negative)
for each biochemical test. Your grade is not solely dependent upon the correct identification
of your unknowns. But, your conclusions must be in agreement with your results. Managers,
have everyone double-check that the results match the identity of each member’s unknown. Identity of Unknown SURE NOT
SURE Sudan III
Test Benedict’s
Test Iodine
Test Biuret
Test Silver
Nitrate Test A
B
C
D
2b. If you have unknowns in the “not sure” column, fill in one or both of the tables below. (1) If you had test results that were ambiguous, complete the following table.
Unknown Test(s) with ambiguous results. Describe ambiguity.
(2) If the test results for your unknown indicated more than one possible food item, complete
the following table.
Unknown Possible Food Items
