Observations of Chemical Changes
Observations of Chemical Changes
Observations from Procedures
Well#/
Question
Chemicals
Reaction
A
NaHCO3 and HCl-CO2
Bubbles
B
HCl and BTB
Turns Orange
C
NH3 and BTB
Still blue- no change
D
HCl and blue dye
Turns green
E
Blue dye and NaOCl
Stays blue – no change
F
NaOCl and KI
Turns pale orange/yellow
G
KI and Pb(NO3)2
Milky yellow solid
H
NaOH and phenolphthalein
Turns bright pink
I
HCl and phenolphthalein Bubbles- cloudy
J
NaOH and AgNO3
Solid formed/ turned brown
K
AgNO3 and NH3
No change
L
NH3 and CuSO4
Tiny particles/ blue
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? I would add HCl and it would bubble if it contained Sodium Bicarbonate
B. You know what color phenolphthalein and bromthymol 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 bromthymol 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?
Soluguard disinfectant – Turned yellow- Acidic
Vinegar - Turned yellow - Acidic
Melabright fabric brightner – turned yellow - Acidic
C. You found a sample of a solution that has a faint odor resembling vinegar. You are verifying that it is indeed vinegar and you add a few drops of phenolphthalein. The sample turns pink. What assumption can you make about this sample? That the solution is a base and it is not vinegar
D. While performing a starch test on several different cookie brands, four tests result in the typical black color of starch-presence, but the fifth gives a yellow-brown color. How might
Observations from Procedures
Well#/
Question
Chemicals
Reaction
A
NaHCO3 and HCl-CO2
Bubbles
B
HCl and BTB
Turns Orange
C
NH3 and BTB
Still blue- no change
D
HCl and blue dye
Turns green
E
Blue dye and NaOCl
Stays blue – no change
F
NaOCl and KI
Turns pale orange/yellow
G
KI and Pb(NO3)2
Milky yellow solid
H
NaOH and phenolphthalein
Turns bright pink
I
HCl and phenolphthalein Bubbles- cloudy
J
NaOH and AgNO3
Solid formed/ turned brown
K
AgNO3 and NH3
No change
L
NH3 and CuSO4
Tiny particles/ blue
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? I would add HCl and it would bubble if it contained Sodium Bicarbonate
B. You know what color phenolphthalein and bromthymol 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 bromthymol 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?
Soluguard disinfectant – Turned yellow- Acidic
Vinegar - Turned yellow - Acidic
Melabright fabric brightner – turned yellow - Acidic
C. You found a sample of a solution that has a faint odor resembling vinegar. You are verifying that it is indeed vinegar and you add a few drops of phenolphthalein. The sample turns pink. What assumption can you make about this sample? That the solution is a base and it is not vinegar
D. While performing a starch test on several different cookie brands, four tests result in the typical black color of starch-presence, but the fifth gives a yellow-brown color. How might