Given an unknown compound in container 3, solubility tests, cation tests, anion tests, and conductivity tests can be used to determine the various properties of the unknown to then make a positive identification of the unknown. These results will not only show chemical and physical properties but also what the unknown compound might react with to form other compounds.
After performing the four anion tests, a positive identification was able to be made showing that the unknown compound contained a chloride ion since a white precipitate was formed from the reaction (Table 1). The sulfate, nitrate, and carbonate tests all yielded negative results when no precipitate was formed. The reaction of the chloride anion is as follows: Cl- + AgNO3 --> …show more content…
The conductivity of the unknown yielded good results in that a solution of water and the unknown compound conducted current twice as well as water alone (Table 2). The average resistance of pure water was 0.0998 mega-ohms and 0.0526 mega-ohms for the solution of the unknown compound and water.
To further identify properties, five reactions were carried out with the unknown compound and the known compound and the results were compared. These five reactions included mixing the unknown with an acid, a base, two with salts, and one that was known to create a precipitate. The same reactions were carried out with the known. Respectively, the known/unknown were reacted with HCl, NaOH, NaCl, CaCO3, and HNO3 and AgNO3. With the results lining up between the known and the unknown, more properties were identified and more evidence for a positive identification.
The five reactions that were carried out further validated our conclusion, since the results were the same between the unknown and the known. For the four that did not react with the unknown, nor did they react with the hypothesized compound, validating the conclusion. For the reaction that formed the precipitate, using stoichiometry, the masses were equal between the unknown beginning, the hypothesized beginning, the unknown ending, and the hypothesized ending, once again confirming our
After performing the four anion tests, a positive identification was able to be made showing that the unknown compound contained a chloride ion since a white precipitate was formed from the reaction (Table 1). The sulfate, nitrate, and carbonate tests all yielded negative results when no precipitate was formed. The reaction of the chloride anion is as follows: Cl- + AgNO3 --> …show more content…
The conductivity of the unknown yielded good results in that a solution of water and the unknown compound conducted current twice as well as water alone (Table 2). The average resistance of pure water was 0.0998 mega-ohms and 0.0526 mega-ohms for the solution of the unknown compound and water.
To further identify properties, five reactions were carried out with the unknown compound and the known compound and the results were compared. These five reactions included mixing the unknown with an acid, a base, two with salts, and one that was known to create a precipitate. The same reactions were carried out with the known. Respectively, the known/unknown were reacted with HCl, NaOH, NaCl, CaCO3, and HNO3 and AgNO3. With the results lining up between the known and the unknown, more properties were identified and more evidence for a positive identification.
The five reactions that were carried out further validated our conclusion, since the results were the same between the unknown and the known. For the four that did not react with the unknown, nor did they react with the hypothesized compound, validating the conclusion. For the reaction that formed the precipitate, using stoichiometry, the masses were equal between the unknown beginning, the hypothesized beginning, the unknown ending, and the hypothesized ending, once again confirming our