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Stoich

# Stoich - Calculating the Density of Salt Solutions Section...

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Calculating the Density of Salt Solutions October 21, 2007 Section 2304 Chemistry 001 Felipe Macedo Nick Hookham, Meredith Lieske, Robert Draths Purpose:

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To determine the stoichiometry of a chemical reaction based upon the presence of a base or an acid and a precipitate. Procedure: The first step was to calibrate the pipette to each of the chemicals being used to measure the volume of 1 drop of each of the solutions. This was done by adding 3mL to a graduated cylinder and counting the drops required to reach that level, cleaning the cylinder between each solution. Next, using the calibrated pipette, test the Job’s Method. This was done by adding an increasing amount of both .1M Ni(NO 3 ) 2 into each well according to the table in the lab manual, while decreasing the drops of .1M NaOH and watching the precipitate. Then divide the wells into half of the previous volume and test each for both the presence of a base, (OH) and excess nickel using alzarian yellow and DMG solutions respectively. Next using the Mole-Ratio method, in clean wells, add and increasing number of drops of .1M and .2M Ni(NO 3 ) 2 to each well, according to the table in the lab manual, that contains already 3 drops of .2M NaOH.
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