Observations of Chemical Changes
Peter Jeschofnig, Ph.D. Version 42-0182-00-02
Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Data Table 1: Reactions Expected
Well #/ Question
Chemicals
Reaction
A
NaHCO3 and HCI - C02
B
HCI and BTB
C
NH3 and BTB
D
HCI and blue dye
E
Blue dye and NaOCI
F
KI and Pb(NO3)2
G
NaOH and phenolphthalein
H
HCI and phenolphthalein
I
NaOH and AgNO3
J
AgNO3 and NH3
K
NH3 and CuSO4
Observations from Procedures
Questions
Use what you learned in this lab to answer the following questions:
A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). How would you test this material for the presence of sodium bicarbonate?
B. You know what color phenolphthalein and bromothymol blue turn when testing an acid or a base. Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol blue. Rinse the pipet well before using it on the next household chemical. When finished with this experiment rinse the pipet well and return it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results. What do these results mean?
C. You found a sample of a solution that has a faint odor resembling vinegar. You are verifying that it is indeed...