Question

[24]Following questions are based on Experiment #17 "General ation unknown analysis The data and results provided pertain to a specific unknown analysis. Provide Answers to the following for this analysis 1 (a) To separate Qualitative Analytical (QA) Group I from the other groups tested in the general cation unknown you must add (b) The precipitate obtained in (a) above was centrifuged and the supernatant liquid decanted. The The warm test tube contained no precipitate. Based on this observation, provide the following: Group I ion(s) precipitate was washed, decanted, water was added to the precipitate and it was heated to boiling questionable: (c) After separating out QA Group I, the remaining QA groups will be found in;(circle your choice) warmed in step(b) in the supematant liquid in wash solution (d) To the sample of unknown solution from which QA Group I has been separated, the analyst added 6 M NaOH. No precipitate was obtained. 6) Does this mean that there are no Group III cations present? YES NO (i) Based on the steps carried out and the observations made provide the following Group III ion(s) present:a Gii) Explain why you grouped each ion, if any, under questionable. absent: (e) In a different analysis and analyst, QA Group IV precipitate is separated from QA Group V by centrifugation and decantation. What conditions are required and what reagent is used to separate QA Group IV from V? () What reagent(s) are required to dissolve the QA Group IV precipitates? Reagent(s); (g) Why did the QA Group IV precipitate(s) dissolve with the reagent used above? (For example, Agl would not dissolve with these reagents.) (h) After separation of QA Group IV by precipitation, Group V ions should be in the supernatant solution. (i) Why can't we test the solution portion for NH,'? (ii) Briefly describe how we would test for NH