observations of chemical changes

Topics: Chemistry, Chemical reaction, Hydrogen Pages: 3 (550 words) Published: June 23, 2014
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 remain blue
D
HCl and blue dye
Clear solution and blue solution turn green when mixed
E
Blue dye and NaOCl
Blue solution and clear solution remain blue
F
Kl and Pb(NO3)2
Two clear solutions turn bright yellow and liquid appears to thicken when viewed on white paper G
NaOH and phenolphthalein
Clear solution and blue solution turn pink when mixed
H
HCl and phenolphthalein
Clear solution and blue solution turn foggy green when mixed I
NaOH and AgNO3
Two clear solutions turn brown when mixed
J
AgNO3 and NH3
Two clear solutions turn silver grey when mixed. 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,...
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