Observations of Chemical Change

Name: Jeanne Yoo|Date: 07/15/13|
Exp 1: Observations of Chemical Changes|Lab Section: 1411-76426|
Data Tables:
Part 1:
|Chemicals|Well No.|Observations of the Reaction|
A.|NaHCO3 + HCl|1
|clear bubbles formed|
B.|HCl + BTB|2
|turned orange after BTB was added, transparent, acidic|
C.|NH3 + BTB|3
|turned dark blue after BTB was added, opaque, basic|
D.|HCl + blue dye|
|blue dye was missing from kit|
E.|Blue dye + NaOCl|
|blue dye was missing from kit|
| with the 1 drop of HCl|
||
F.|NaOCl + KI|4
|small white precipitate, color changed to black after starch was added |
| with 1 drop of starch|
||
G.|KI + Pb(NO3)2|5
|turned bright yellow, milky texture|
H.|NaOH + phenolphthalein|6
|turned dark pink, magenta|
I.|HCl + phenolphthalein|7
|clear|
J.|NaOH + AgNO3|8
|turned brownish green, cloudy|
K.|AgNO3 + NH3|9
|turned light brown|
|after exposure to bright light|
||
L.|NH3 and CuSO4|10
|light blue, cloudy|
Part F: Testing of Various Foods with the NaOCl + KI solution

Foods|Presence or Absence of Starch|

bread|present|

tortilla chip|present|

broccoli|absent|

banana|present|

cheerios|present|

cheese|absent|

potato|present|

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| liquid detergent|
1|darker ring on outside, dark blue (bromothymol blue) sits on top of light blue detergent, basic | oxi clean (stain remover)|
2|bubbles, turns greenish yellow and after a while it turns dark yellow, acidic| bleach| 3|bromothymol blue dissolves once it touches the