Question

Group 1 Flowchart Use the following chemical facts to construct a flow chart for this lab: 1 Group 1 cations are Ag, Hg, and Pb 2. AgH a and Pbare given to you in lab as their nitrates which are soluble in water (denoted by as) 3 AgHgand Pb are the only common ions that form a precipitate (denoted by with the Cl ion, presented as Hcl They all form white precipitates. 4. These Group 1 precipitates are separated from non-Group 1 cations by centrifugation followed by decantation. Centrifugation speeds up the sedimentation of floating precipitate so that the liquid is poured out of the test tube leaving the solid behind (decantation) s. Pbcl unlike Agcl and Hg,cl is soluble in hot water and dissociates into Pbua and 2 C 6 Pbreacts with the chromate ion (Cro to form a yellow precipitate, PbCro 7. Both Agcl and Hg Clreact with aqueous ammonia (NHs (a Agclreacts with NH ja to forma soluble complex, [Ag(NH) ch]( Hg,Cl react with NH,to form elemental Mercury (Hg a silver liquid) and HgNH,Cl (black/grey precipitate). & The addition of HNO, (a) to the [AglNH"Cl]complex causes the reprecipitation of Agcl A is 5 NG Bis 5 NG On a blank sheet of paper, reproduce the Flowchart below and write in the answers for A - P C is as you get them correct. NG 0.5 Bring your Flowchart to lab. D is 5 NG Flowchart Group I- V Cations E is 0.5 NG F is 0.5 NG A G is Decantate Group Il V Cations B .5 NG C H is 0.5 NG Lis 5 NG Decantate that contains D AE precipitate that contains F J is 0.5 NG H K is NG Lis Hgi L precipitate AI precipitate Decantate .5 NG that contains J that contains K that contains M Mis N NG N is A O precipitate ,5 NG that contains P O is NG Pis NG Group 1 Virtual Unknown Your Instructor gives you a test tube (we'll call it Test Tube A, or TT A) containing your Group 1 Unknown. Your task today is to identify which Group 1 cations are in your unknown. You do this by performing the following steps in lab and observing what happens at each step. i. You add HCl to TT A and a white precipitate forms You centrifuge T A to sediment the solid. Then you decante the liquid away from the precipitate. 2 3 You add water to the precipitate in TT A and stir the solution while heating. 4 You centrifuge TT A and decante the liquid into another test tube (TT B). You add K,Cro, to TT B and observe that the solution turned yellow but no precipitate formed NG 2 6 You add NH, to TT A and observe that no precipitate forms f there is a precipitate in TT A, you centrifuge TT A and pour the decantate into TT C If there isn't a precipitate in TT A, you pour the liquid from TT A into TTC 7. You add HNO, to TTC and observe that a white precipitate forms & Use the dropdown list to the right to identify the unknown cations in your Unknown sample.

Answer 1

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