Qualitative Analysis of an Ionic Compounds

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From Logic Trees to Known Solutions If any type of food is contaminated, the public will want to know what the contaminate is so they know what precaution they should take. With the unknown solution, the solution can be figured out with several and vigorous tests or with the use of logic trees. The purpose of this project was to create logic trees for cations and anions and then use them to determine an unknown solution. Project 2 Part 1 Materials and Methods In part 1 of project 2, 5 different cations were used for elimination tests and then a confirmation test was given afterwards to verify the cations. The cations used were K+, Fe3+, Zn2+, Cu2, and Co2+. The first elimination test was metal hydroxide test where all five cations are used. 10 drops of each cation are placed in a centrifuge tub. 6M NaOH was added to each tube dropwise until a precipitate was formed. One cation is to be eliminated. If a precipitate was formed earlier, then 10 more drops of NaOH was added to the tubes. With these test, another cation is eliminated. The second elimination test which was the ammonia test which was performed with the three cation left. 10 drops of each cation that are left are added to clean centrifuge tubes. 15M NH4OH was added dropwise until a color change or a precipitate was formed with no more than 20 drops added. A cation should be eliminated. If the solution formed a precipitate before, then 10 more drops of the 15M NH4OH was added to the solution. The last two cations should be separated with the observations of the additional NH4OH added. With that all the cations are separated, a confirmation test was given to all the cations. 20 drops of each cation solution were placed in new centrifuge tubes. A Bunsen burner was set up with a sharp blue cone that was inside of the flame, then a Nichrome loop was dipped into HCl then dipped into one of the cation

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