Chemistry Lab

Topics: Color, Blue, Primary color Pages: 5 (746 words) Published: July 24, 2014

Name: Marisa Malazzo
Date: 7/17/14
Exp 1: Observations of Chemical Changes
Lab Section: 76426
Data Tables:
Part 1:

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

no color change, some small bubbles formed
B.
HCl + BTB

changed a yellowish orange color, no bubbles or precipitation C.
NH3 + BTB

changed a blue color
D.
HCl + blue dye

changed a green color
E.
Blue dye + NaOCl

no chemical change, only blue color appeared

with the 1 drop of HCl

blue green then changed to yellow
F.
NaOCl + KI

turned blackish brown

with 1 drop of starch

turned black then back to yellowish brown
G.
KI + Pb(NO3)2

bright yellow and almost like it had pulp consistency to it
H.
NaOH + phenolphthalein

bright purple magenta and thick liquid consistency
I.
HCl + phenolphthalein

no color change or physical changes
J.
NaOH + AgNO3

turns light brown then forms brown chunks in the liquid
K.
AgNO3 + NH3

color stayed clear

after exposure to bright light

dark brown and appeared to have some substance separation
L.
NH3 and CuSO4

cloudy light blue color then separated into white and blue segments Part F: Testing of Various Foods with the NaOCl + KI solution

Foods
Presence or Absence of Starch

peanut butter
absence of starch

chip
presence of starch

bread
presence of starch
cookie

presence of starch
french fry

presence of starch
chocolate bar

absence of starch
ice cream

absence of starch

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
Windex

the chemicals turn pink when mixed together
Bleach

the chemicals turn pink when mixed together
Ammonia

no physical reaction to see

Conclusion:

The objective of this experiment was to infer what happens when different chemicals are mixed together. After completing this experiment several of the chemicals just simply changed colors. The main colors shown were blue, yellow, pink, green, and a brownish black. A few of the reactants did not change to a different color at all, but did show little signs of bubbles at the surface.

The household items had similar reactions as the chemicals provided in the kit as far as color changes and slight physical precipitation. I attempted to be sure and drop the same number of drops in the beaker when testing the reactions to reduce the percent error throughout the experiment. I do believe the goal of this experiment was achieved because I did learn how to decipher between acids and bases as far as the color change during the reactions.

The experiment was very helpful in learning how the chemicals do react with each other. Some chemicals change colors, some chemicals remain the same color, but bubble or precipitate, while others might no have any apparent physical change at all. All chemicals react differently to each other in different situations, lighting, temperatures and surroundings. Learning about these different chemicals was very intriguing to me and a fun experiment to do as well.

Questions and Problems:

A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate, NaHCO3). How would you test this material for the presence of sodium bicarbonate?

The best thing would be to use HCl to test the chemical and see if there are any apparent bubbles within the two.

B. Looking at the household chemicals you tested with bromthymol blue, what can you deduce from the test...
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