Observation Of Chemical Changes Lab Report
Michelle Felton
Observation of Chemical Changes
June 17, 2014
Chem 107
Purpose:
To associate chemical properties with household products
To observe some properties of chemical reactions Procedure: Using a 96 well plate and a pipette each chemical was placed into its individual well, two drops of a second chemical were added and the observations of the reaction/changes were recorded. The new mixture was viewed on a light and on a dark background to observe all changes. Data Table 1: Reactions Expected
WELL # / QUESTION
CHEMICALS
REACTION
A
NaHCO3 and HCL-CO2
Bubbles form at bottom of well and rise to top of well then burst.
B
HCl and BTB
Clear solution and blue solution turn yellow when mixed
C
NH3 and BTB
Clear solution and blue solution …show more content…
Liquid mixture appears to thicken when mixed
K
NH3 and CuSO4
Two clear liquids turn to pearly blue when mixed
Observations from procedure: BTB remains blue when exposed to a base and turns yellow when exposed to an acid. Phenolphthalein turns grey when exposed to a base and pink when exposed to an acid. Both chemicals turn a murky or foggy green when neutral.
Questions:
a) To test for sodium bicarbonate we could use hydrochloric acid. The two form bubbles when mixed. These bubbles are carbon dioxide.
b) I tested 3 cleaners, Windex, Lestoil, and green cleaner with bleach alternative. (My husband saw the cleaners out, smelled them in the air and actually took me to dinner because he believed that I spend the day cleaning the house.) All 3 cleaners were exposed to BTB and Phenolphthalein to determine if the cleaners were acidic or basic. All 3 cleaners were greenish bluish showing that they are neutral. I am confident that this is so that the products are not liable for any skin irritation or pet/child danger from these products.
c) When phenolphthalein is exposed to an acid it turns pink, therefore vinegar is an
Observation of Chemical Changes
June 17, 2014
Chem 107
Purpose:
To associate chemical properties with household products
To observe some properties of chemical reactions Procedure: Using a 96 well plate and a pipette each chemical was placed into its individual well, two drops of a second chemical were added and the observations of the reaction/changes were recorded. The new mixture was viewed on a light and on a dark background to observe all changes. Data Table 1: Reactions Expected
WELL # / QUESTION
CHEMICALS
REACTION
A
NaHCO3 and HCL-CO2
Bubbles form at bottom of well and rise to top of well then burst.
B
HCl and BTB
Clear solution and blue solution turn yellow when mixed
C
NH3 and BTB
Clear solution and blue solution …show more content…
Liquid mixture appears to thicken when mixed
K
NH3 and CuSO4
Two clear liquids turn to pearly blue when mixed
Observations from procedure: BTB remains blue when exposed to a base and turns yellow when exposed to an acid. Phenolphthalein turns grey when exposed to a base and pink when exposed to an acid. Both chemicals turn a murky or foggy green when neutral.
Questions:
a) To test for sodium bicarbonate we could use hydrochloric acid. The two form bubbles when mixed. These bubbles are carbon dioxide.
b) I tested 3 cleaners, Windex, Lestoil, and green cleaner with bleach alternative. (My husband saw the cleaners out, smelled them in the air and actually took me to dinner because he believed that I spend the day cleaning the house.) All 3 cleaners were exposed to BTB and Phenolphthalein to determine if the cleaners were acidic or basic. All 3 cleaners were greenish bluish showing that they are neutral. I am confident that this is so that the products are not liable for any skin irritation or pet/child danger from these products.
c) When phenolphthalein is exposed to an acid it turns pink, therefore vinegar is an