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12 Nov 2019
Suppose you have another unlabelled solution, and it contains one of the five dissolved compounds from the experiment, as in the column headings. So, you add a few drops to a solution of HNO, (nitric acid) and a lot of bubbling results from an odorless, nontoxic gas (not NH,, H2S, or SO.). Then, you add a few drops to an AgNO, solution, and a precipitate forms Mixing with a solution of KOH does nothing:; there is no precipitate or odor. Mixing with a solution of K,PO, does nothing either. Identify the dissolved compound. Explain the results for all four of the chemical tests. (2 pts) 4. 5. Use your experimental results and the solubility rules to find reagents that could be used to distinguish between the ions in each of the following pairs. That is, the reagent must create a precipitate or gas with one of the two ions, but not react with the other ion. Explain the difference between the two results for each pair of ions. (2 pts) a. Pb and Ba (find an anion that precipitates with one and not the other) b. K and Ba(find an anion that precipitates with one and not the other) c. K and NH4 (find an anion that creates a gas with one of the cations) d. CI and SOa (find a cation that precipitates with one and not the other)
Suppose you have another unlabelled solution, and it contains one of the five dissolved compounds from the experiment, as in the column headings. So, you add a few drops to a solution of HNO, (nitric acid) and a lot of bubbling results from an odorless, nontoxic gas (not NH,, H2S, or SO.). Then, you add a few drops to an AgNO, solution, and a precipitate forms Mixing with a solution of KOH does nothing:; there is no precipitate or odor. Mixing with a solution of K,PO, does nothing either. Identify the dissolved compound. Explain the results for all four of the chemical tests. (2 pts) 4. 5. Use your experimental results and the solubility rules to find reagents that could be used to distinguish between the ions in each of the following pairs. That is, the reagent must create a precipitate or gas with one of the two ions, but not react with the other ion. Explain the difference between the two results for each pair of ions. (2 pts) a. Pb and Ba (find an anion that precipitates with one and not the other) b. K and Ba(find an anion that precipitates with one and not the other) c. K and NH4 (find an anion that creates a gas with one of the cations) d. CI and SOa (find a cation that precipitates with one and not the other)