Exp 1

Name:
Date:
Exp 1: Observations of Chemical Changes
Lab Section:
Data Tables:
Part 1:

Chemicals
Well No.
Observations of the Reaction
A.
NaHCO3 + HCl

A1 clear, bubbles
B.
HCl + BTB
B1

yellow, clear
C.
NH3 + BTB

C1 clear blue
D.
HCl + blue dye
D1

green
E.
Blue dye + NaOCl
E1

clear blue

with the 1 drop of HCl

green/blue
F.
NaOCl + KI

A2 rusty-yellow with 1 drop of starch

black
G.
KI + Pb(NO3)2
B2

yellow, not clear
H.
NaOH + phenolphthalein

A3 purple, violet
I.
HCl + phenolphthalein

A4 clear J.
NaOH + AgNO3
D3

murkey, brown
K.
AgNO3 + NH3

A4 purple, then cloudy white/clear

after exposure to bright light

pink tint
L.
NH3 and CuSO4

A5 cloudy dark blue
Part F: Testing of Various Foods with the NaOCl + KI solution

Foods
Presence or Absence of Starch potato yes

lettuce turned somewhat dark green chip yes tortilla yes hot dog bun

yes

Part 2:
Household Chemicals with Bromthymol Blue

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.

Household Chemicals
Well No.
Observations of the Reaction palmolive soap

H12 dark green windex G12

dark blue distilled vinegar
F12

yellow

Conclusion:

The objective of this experiment was to observe how different chemicals react. I was able to see how acids react with other compounds. When testing the foods with NaOCl and KI solutions, I was able to determine which foods around the house had starch. The chip, tortilla and hot dog bun immediately turned black once the KI solution was dropped. The potato turned a lighter black, and it took awhile for the color to show up. This could be a result of the potato being so dense. The lettuce turned a darker green