Date of Experiment: June 17, 2012
Report Submitted: June 17, 2012
Title of Experiment: Observation of Chemical Changes
Purpose: To examine the reaction of common chemicals from household consumer products, and the changes they undergo.
Procedure: After combining the chemicals listed below in Data Table 1, I observed the mixture against white and dark backgrounds by slipping white and black paper underneath the well plate. For every reaction, I wrote down the chemical combination, the well number, and my observations of the chemical reactions against the white and dark backgrounds.
Data Table 1: Reactions Expected
Well #/ Question
| NaHCO3 and HCI - C02
| The mixture didn’t look any different amongst the contrast of each colored background.
| HCI and BTB
| The mixture is orange. The color doesn’t change amongst the contrast of each colored background.
| NH3 and BTB
| The mixture is blue. I expected the mixture to turn orange
| HCI and blue dye
| The mixture is green.
| Blue dye and NaOCI
| Prior to adding the HCl the mixture was light blue, after the addition of HCl the mixture turns yellow.
| NaOCI and KI
| Prior to adding the starch the mixture turns brown, after adding the starch the mixture turns black. Foods tested: American Cheese- No starch, Fig Newton- Starch, Goldfish Cracker-Starch.
| KI and Pb(NO3)2
| Mixture turns yellow & the precipitate after an hour lapse in time turned solid.
| NaOH and phenolphthalein
| Mixture turns purple.
| HCI and phenolphthalein
| The mixture looked as if it remained clear on the white background, but when placed on the black background the mixture appeared cloudy. I expected when mixed w/an acid it would turn yellow and w/ a base it would turn blue.
| NaOH and AgNO3
| The mixture turned a cloudy brown color.
| Paper Towel
| AgNO3 and NH3
| After exposing the mixture to a 60 watt light-bulb, the...
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