Observations of Chemical Changes

Data Tables:
Part 1:

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

1A
Bubbles appeared for 5 seconds. Now clear in color, no bubbles
B.
HCl + BTB

2A
Turned from clear to yellow
C.
NH3 + BTB

3A
Turned from clear to dark blue
D.
HCl + blue dye

4A
Turned from clear to green
E.
Blue dye + NaOCl

5A
Turned from blue to light blue

with the 1 drop of HCl

6A
Turned from blue->light blue->yellow->light yellow->clear, transparent
F.
NaOCl + KI

7A
Turned from clear to Light yellow

with 1 drop of starch

8A
Then turned to dark brown
G.
KI + Pb(NO3)2

9A
Turned from clear to opaque yellow
H.
NaOH + phenolphthalein

10A
Turned from clear to rose color
I.
HCl + phenolphthalein

11A
No color change, clear and transparent
J.
NaOH + AgNO3

12A
Turned from clear to translucent light gray
K.
AgNO3 + NH3

1B
Many tiny particles forming on the bottom for 3 minutes, then disappeared

after exposure to bright light

L.
NH3 and CuSO4

2B
Turned from clear to opaque light blue
Part F: Testing of Various Foods with the NaOCl + KI solution

Foods
Presence or Absence of Starch

A piece of bread
Spot turned dark, starch presents

Blue berry
Spot did not turn, starch is absent

Girl scout cookie
Spot turned dark, starch presents

Pistachio
Spot turned dark, starch presents

Green bean
Spot did not turn, starch is absent

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
Hand soap
1C

Liquid quickly turned green
Windex
2C

Liquid quickly turned yellow
Disinfecting wipes
3C

Liquid quickly turned yellow