Observations of Chemical Changes Labpaq

Topics: Acid, Chemistry, Bicarbonate Pages: 2 (578 words) Published: April 29, 2013
Observations of Chemical Changes

Purpose/Hypothesis: To observe how acids react with bases and examine reactions of common household cleaners and the macroscopic changes these chemicals undergo. I expect for each solution to react differently when mixed with acids and bases. Procedure:

I have a well-plate-96, a piece of white and black paper, and the chemicals from the Observation of Chemical Changes Experiment Bag. I used a different well for each combination of solutions. I placed two drops of one chemical then two drops of a different chemical. Observation:

NaHCO3 and HCl - Clear bubbles; bubbles did not fizz.
HCl and BTB- Color changes to orange after the BTB is added. NH3 and 1 drop of BTB- Turned dark blue.
HCl and Blue Dye - Turned dark blue
Blue Dye and NaOCl- Turned dark blue then aqua blue.
NaOCl and KI- Turned yellow.
KI and Pb(NO3)2- Cloudy yellow.
NaOH and phenolphthalein- Dark pink.
HCl and phenolphthalein- Clear w/ No bubbles.
NaOH and AgNO3 – Olive green.
AgNO3 and NH3- Clear w/ Bubbles
NH3 and CuSO4- Cloudy aqua blue.
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 test it with HCl to see if it begins to bubble.

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? *When mixed with Windex the solution remains blue. When mixed w/ Grease Lightening the solution remained blue. When mixed with Quick Shine Floor Finish Solution...
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