Section 2.4: Determination of Percent Ammonia For this procedure, the purpose was to determine the percent ammonia within our unknown synthesized compound. First, boric acid was dissolved inside of a flask that was then placed inside of a large beaker. For one solution, 0.3768 grams of the violet cobalt sample was incorporated into a separate flask along with solid sodium hydroxide. With the aid of glass tubing, the rubber stopper end of the tub sealed the flask containing the cobalt sample and the tapered tip went inside of the flask holding the boric acid. The cobalt sample flask was heated for precisely 25 minutes, while ice water was periodically added to the beaker outside of the boric acid flask to ensure that the liquid would not clog up inside of the tubing. After the allotted time period, the cobalt sample turned a dark brown, almost black color, and the liquid consistency thickened and reduced significantly as well. A few drops of brom-cresol-green indicator were added to the boric acid solution, and titration with 0.3M HCl began. This exact process was repeated an additional two times, with 0.3761 grams of the cobalt sample for the second…show more content… Exactly 0.1524 grams of cobalt sample was added to a 100 mL volumetric flask along with a few drops of concentrated Hydrobromic acid and deionized water. After covering it with parafilm, the experimenter used the inversion technique in order to completely dissolve the cobalt sample. After filling a cuvette with the solution and blanking a spectrophotometer with a cuvette filled with deionized water, the testing cuvette was ready to be scanned. By manipulating the original equation of Beer’s law, the percent cobalt was calculated once the maximum wavelength value was found. The final results of the visible spectroscopy experiment showed that there was 15.466% cobalt in our