Observation of Chemical Changes

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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.

Observations:
Data Table 1: Reactions Expected|
Well #/ Question| Chemicals| Reaction|
A| NaHCO3 and HCI - C02| The mixture didn’t look any different amongst the contrast of each colored background. | B| HCI and BTB| The mixture is orange. The color doesn’t change amongst the contrast of each colored background. | C| NH3 and BTB| The mixture is blue. I expected the mixture to turn orange| D| HCI and blue dye| The mixture is green. |

E| Blue dye and NaOCI| Prior to adding the HCl the mixture was light blue, after the addition of HCl the mixture turns yellow. | F| 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. | G| KI and Pb(NO3)2| Mixture turns yellow & the precipitate after an hour lapse in time turned solid. | H| NaOH and phenolphthalein| Mixture turns purple. |

A-2| 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. | B-2| 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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