Observation of chemical change LabPaq Essay

Observations and Chemical Changes

By:  Andre the Giant Higgson

02/19/14

CHE  107  E1

Intro to Chemistry 1

Objective

Certain Chemicals like Bromthymol blue and Phenolphthalein can be added to other chemicals to� determine acidity or basicity.  Other reactions can be observed as well when different chemicals are� added to each other.

Method

This experiment involved placing drops of specified chemicals into a well on a 96­well plate.  Each well� number was recorded along with question number and name of chemicals involved.  Two drops of a� chemical were placed in a well along with two drops of another chemical.  Chemical reactions and color� changes were recorded in Data Table 1.

Findings

During the experiments a few problems were encountered.  One of the chemicals provided differed� slightly from chemical description in the lab manual.  The lab manual called for the chemical NH3 which� is Ammonia.  The chemical provided was an Aqueous Ammonia solution of NH4OH.  When holding up� the solution of AgNO3 and NH4OH to a light source for 5 minutes it was observed that no reactions� took place despite the information contained in the lab manual.  Also while testing the household� chemical Brite,  It was observed that the Bromthymol Blue changed to a green color that was not� observed in any other test involving BTB. �

Questions

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? To test for the presence of sodium bicarbonate you could collect a sample of the household product and� add HCl to it and see if you observe any CO2 bubbles. � B.  You know what color phenolphthalein and bromothymol 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 bromothymol blue.  Rinse the pipet well�...



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