Question

1. Write net ionic equations for ALL precipitation reactions of each anion studied in this e with Ag'(aq) and Ba (a), respectively, (in the absence of HNO,) at Bad 2 ptt disalve 51 과 IND Add about 10 drops of deionized water and 10 drops of 6 MNH, to the precipitate and mix thoroughly. Note that the Agl precipitate will persist; Agl is not soluble in NHs solution Confirmation Test for lodide Carry out confirmatory test for iodide as follow: place 10 drops of 0.1 M Nal and 10 drops of deionized water in a clean test tube; then add 10 drops of 0.1 M FeCl, solution. If an orange or brownish precipitate is formed, add 1-2 drops of 6 MHCI to dissolve the precipitate. Add about 20 drops of cyclohexane and gently shake or swirl the test tube to mix the solution. The upper cyclohe xane layer will appearance violet due to the presence of 12. (I-is oxidized to 12 by Fe3+ ior Step-3: Test for Carbonate (COs) Place abou 0 drops of 0.2 MNa,CO, in a clean test tube and add 10 drops of 0.1 M BaCl2. A white prewpitat clear solution. Then add 10 drops of 6 MHCl to the precipitate drop-by-drop with stirring and observe the "f e of BaCO, will appear. Centrifuge the precipitate for 1 minute and discard the reaction as CO: gas is produced [All carbonat. uduce CO, when treated with acids: CO, (a)2H,O'(ag) CO2g)+3H,O] Alternative te. r Carbonate: Place about 1 mL of 0.2 M Na2CO3 solution in a clean test tube. Hold the test tube in a slanting sition (abou. ngle) and add 10 drops of 6 MilCl down the wall of test tube. Observe the formation ofsles or "fizzing" when the acid solution comes in contact with Na CO3 solution.] Step-4: Test for Sufate (SO4) Place about 10 drops of 0.2 MNa SO, in a clean test tube and add 10 drops of 0.1 M BaCl2. A white precipitate of BaSO, will form. Centrifuge the precipitate for 1 minute and discard the clear olution; then add 10 drops of deionized water and 10 drops of 6 M HCI and stir the mixture. The precipitate will NOT dissolve. BaSO4 is insoluble in acid solutions. Step-5: Test for Phosphate (PO) Place 10 drops of 0.2 M NasPO4 in a clean test tube and add 10 drops of 0.1 M BaCl precipitate of Ba (PO)h will slowly form. Cent clear solution. Then add 10 drops of 6 M HCI and rifuge the precipitate for 1 minute and discard the stir the mixture. Bas(PO,) will readily dissolve in dilute acid Confirmation test for Phosphate drons of 0.2 M Na,PO in a clean test tube; add 4 drops of 6 M HNO, followed by 1 mL Place 10 drops o ammonium molybdate solution, (NHMo-O,. Gently mixture the solution and then place the r bath for 3-5 minutes. Note the appearance of bright yellow precipitate due test tube in a hot wate rmation of ammonium phosphomolybdate, (NH) PO..12MoO,] Step-1: Test for Chloride (CT) Place about 10 drops of 0.2 M NaCl and 10 drops of deionized in a clean test tube; add 1-2 drop of 6 M HNO, followed by 10 drops of 0.10 M AgNOj. A white precipitate of AgCI will appear Centrifuge the precipitate for 1 minute and discard the supernatant (the clear solution) Add about 10 drops of deionized water and 10 drops of 6 M NH, to the precipitate and mix thoroughly. AgCl will dissolve in NH, solution. If the precipitate does not di add 2 more drops of 6 M NH, solution and mix to dissolve the precipitate. Then acidify the solution by adding 6 M HNO, drop-by-drop until a white precipitate of AgCI re-appears. This confirms AgCl. (The solution may only appear cloudy if the solution becomes too dilute ) ssolve completely Step-2: Test for lodide (T) Place about10 drops 0.2 MNal and 10 drops of deionized of 6 M HNO, followed by 10 drops of 0.10 M AgNO. A pale yellow, precipitate o form. Centrifuge the mixture for 1 minute and discard the superinatant (the clea water in a clean test tube, add 1-2 drops f Agl will solution

Answer 1

Ba log

Foe loa 8A0 A21+20