Observations of Chemical Changes

Topics: Chemistry, Acid, Sodium bicarbonate Pages: 5 (1103 words) Published: October 1, 2013

Laboratory ReportTitle: Observations of Chemical ChangesDate: 9/9/13Name: Purpose:
The purpose of this experiment is for the student to gain knowledge and experience regarding how avariety of chemicals react to one another. In addition, the student should also gain a betterunderstanding of the household chemicals that they use in their day to day lives.Procedure:Observe the chemical changes that occur by mixing a list of chemicals (provided in the lab manual).Add 2 drops of the first chemical into a well in the 96 well plate and then add the second chemical.Observe the mixture against white and dark backgrounds by sliding white and black paper under thewell plate.Record reactions.Observations:This experiment allowed me to observe the chemical reactions that occur between a variety ofchemicals and some indicators.The following observations were made: NaHCO3 and HCI – CO2 HCI and BTB NH3 and BTB HCI and blue dye Blue dye and NaOCI NaOCI and KI KI and Pb(NO3)2 NaOH and phenolphthalein HCI and phenolphthalein NaOH and AgNO3 AgNO3 and NH3 NH3 and CuSO4

Data Tables:

Data Table 1: ReactionsReaction

Question/WellNumberA/H12

Chemicals

NaHCO3 and HCI - CO2 When I added the hydrochloric acid to the sodium

bicarbonate it began to bubble and fizz almostimmediately. This solution continued to bubble forseveral minutes. There was no color change and I didnot detect any noticeable odors.When I added the BTB to the hydrochloric acid itturned a yellow-orange color. It did not fizz or bubbleand had no detectable odor.When I added the BTB to the NH3 the solution turnedblue immediately. There was no fizzing or otherobservable changes.When I added the blue dye to the hydrochloric acid thesolution seemed to turn a blue green color. It did notbubble or have an odor.Blue dye and NaOCI When I added the sodium hypochlorite to the blue dyethe didn't seem to be a chemical reaction. I did notobserve color change, fizzing or smells.No observable changes.Lead and potassium reacted to each other by fizzingand turning a bright, saturated yellow.NaOH andThis solution turned a bright pink immediately afterphenolphthaleincontact. There were no other observable changes.HCI and phenolphthalein This mixture became opaque on contact. It seemed likeit was fizzing a little with contributed to the opaquequality.This solution turned brown on contact. There were noother observable changes.These substances fizzed and turned opaque uponcontact. There was no other observable changes.This mixture seemed to fizz a little bit and turned alight blue color.

B/G12

HCI and BTB

C/F12

NH3 and BTB

D/E12

HCI and blue dye

E/D12

F/C12G/B12

NaOCI and KIKI and Pb(NO3)2

H/A12

I/A10

J/B10

NaOH and AgNO3

K/C10

AgNO3 and NH3

L/D10

NH3 and CuSO4

QuestionsA. Suppose a household product label says it contains sodium hydrogen carbonate (sodiumbicarbonate). How would you test this material for the presence of sodium bicarbonate?Sodium bicarbonate is also known as baking soda and is a common household product and ingredient.If you wanted to test to see if a product has baking soda in it you can take a sample and add HCI, orhydrochloric acid to see if it bubbles. These two chemicals combine to make carbon dioxide whichbubbles and fizzes for a few moments.B. You know what color phenolphthalein and bromothymol blue turn when testing an acid or abase. Use the empty pipet in the Auxiliary Supplies Bag to test at least threehousehold items including household cleaning products with bromothymol blue. Rinse the pipet

well before using the next household chemical. When finished with this experiment rinse the pipetwell and return it to the auxiliary bag for use in future experiments. Name the items tested andrecord their results.SubstancesV8 Fusion PomegranateBlueberry vegetable and fruitjuice.Lysol Bathroom Cleaner

ReactionThe juice had a light red color before I added anything to it. When...
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