GEN CHEM QUAL ANLY LB
GEN CHEM QUAL ANLY LB CHM 2046L
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This 7 page Class Notes was uploaded by Brigitte Wyman on Friday September 18, 2015. The Class Notes belongs to CHM 2046L at University of Florida taught by James Horvath in Fall. Since its upload, it has received 7 views. For similar materials see /class/207015/chm-2046l-university-of-florida in Chemistry at University of Florida.
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Date Created: 09/18/15
Scheme for Unknown 9 Description A Phase solubility color odor shape A pure salt gt usually insoluable 1 anion 1 cation Alum 2 cations 1 anion o KALOH26SO42 6H20 o NH4AIH206SO42H20 B 3 or more ions gt usually soluable Flame Test USE PEA SIZED SOLID WITH 5 DROPS OF 6M HN03 On spot plate A Orange flame Na present possibly K NH4 B Red flame Ca2 present no Na C Purple flame K present possibly NH4 D Green flame CuOH262 E No change in flame color Ca2 K Na absent possibly NH4 MgOHZ6 AOH26 present I pH Test A Add a little bit of unknown to a small amount of neutral water B Fill several vials with test solution and use indicators to determine pH C If colored use pH paper Common pHs for Anions and Cations pH 15 HSO4 present CO32 HCO3 OH not present pH 3 35 AH2063 present CO32 HCO3 OH not present pH 4 Cu present OH CO32 HCO3 not present pH 5 6 NH4 andor MgH2062 present andor Ag andor Zn pH 7 Cl andor NO3 andor 5042 andor K andor Na andor Ca2 andor Ag present pH 9 10 HCO3 present HSO4 OH and AH2063 not present pH 10 12CO32 present HSO4 AH2063 NH4 not present pH 13 OH present NH4 AH2063 HSO4 HCO3 not present If unknown is an insoluble compound use the liquid to test pH by using saturated solution not recommended to use pH as determinate pH 7 CaSO42H20 pH 95 MgCO3 pH 10 CaCO3 pH 105 MgOH2 pH 125 CaOH2 pH 13 S2 lnsoluabie Colored 0 CuO 0 Ago 0 AgZSO4 o CuCO3 o Ag2Co3 o CuS o AgZS Add 2M llNO3 in excess 1 Dissolves AgO or CuO Add NaCl 0 Precipitate gtAgO o No Precipitate gtCuO 2Dissolves with Bubbles CuCO3 or Ag2CO3 Add NaCl 0 Precipitate gt Ag2 C03 0 No Precipitate gt CuCO3 3 Does not Dissolves Add 15M HNO3 and place in water bath 0 Blue or green solution gtCuS 0 Yellow or clear solution gt AgZS White 1 Flame Test Red gt Ca2 Dissolve in 6M HCl 1 Dissolves gtCaOH2 2 Dissolves with Bubbles gt CaCO3 3 Does not Dissolve gt CaSO4 2H20 No Change Add 3M H2504 1 Dissolves MgOH2 ZnOH2 2 Dissolves with Bubbles MgCO3 ZnCO3 3 Dissolves with Smell gtZnS 4 Does not Dissolve Start new solution by mixing unknown in DIW then centerfuge Use liquid portion to do sulfate test Add 6M HNO3 until acidic Add one drop of025M BaNO32 1 Precipitate gt AgZSO4 2 No Precipitate gtAgCl Cations 1 Ag Test a Add NaCl i Precipitate gt Ag present 1 Continue to add NaCl till no more precipitate forms 2 Centrifuge 3 Use Liquid on next test ii No Precipitate gt No Ag 2 Al3 and Mg2 test a Add 6M NH3 i Precipitate forms ii Centrifuge and use solid for test use liquid for next test 1 Add excess 2M NaOH a Precipitate dissolves i A13 b Precipitate remains i Mg2 ii May also have Al3 3 Cu2 and Zn2 Test a Add 45mL of TAA and a few NaACcrsytals b Heat in hot water bath c Precipitate i White gt Zn2 ii Dark green Black gt Cu2 1 May also contain Zn d Centrifuge i Use liquid for next test ii Use solid if Cu2 present 1 Add excess 3M H2504 2 Centrifuge 3 Treat liquid with excess Na2CO3 a White precipitate gt Zn2 present b No precipitate gt no Zn2 4 Ca2 Test a Add 05M Na2CO3 b Precipitate gt Ca2 present c No precipitate gt no Ca2 present Create new solution to test for other cations 5 NH4 Test a Place about 2 5mL of sample solution in vial b add an equal amount of 1M NaOH to form NH3 c If smell of NH3 is present then NH4 is present and pH test will be that of a basic solution 6 K Test a Add 10M NaOH at equal amounts b Heat c Makes sure to remove all NH4 If NH4 is present be sure to remove it before testing for K by DW ii In small vial place remains of above test iii Add 1 drop of 6M HAc and 2 3 drops of Cobaltnitrite reagent iv If yellow ppt forms K is present Anions 1 Cl Test a Place several drops of sample solution in vial and add 1M HN03 until solution is acidic test acidity with red litmus paper b Add one drop of 002M AgN03 c If cloudy ppt forms then Cl is present 2 SO42 HSO4 Test a Place several drops of sample solution in vial and add 1M HN03 until acidic test acidity with red litmus paper b Add one drop of 025M BaN032 c If cloudy ppt forms then 04 is present unless C032 is present d To distinguish between 04 and HSO4 test pH 3 N03 Test a Place small crystal of Fe0H26NH42SO42 in a spot plate b Cover crystal with a few drops of the sample solution c Immediately add 2 drops of 18M H2504 d If brown solution forms N03 is present 4 C032 HC03 Test a Treat sample solution with 1M HCI to observe generation of colorless odorless gas C02 To distinguish between C032 and HC03 test pH If test is positive for C02 and isn t very soluble in H20 it is C032 PIT 1 L1 quotwane4 L w lquotfbr 6m NH AK eb xl m 7AA r Maw quot x39 9rm aramp VPLE Ax m3 u39 Lh m Urka v f K 1 139 3 39 1 CA xw LQWMUW Alexandra Redmond Unknown Scheme2 I Description A Phase solubility color odor shape II Flame Test A Orange flame Na present possibly K NH4 B Purple flame K present possibly NH4 C No change in flame color K Na absent possibly NH4 present III pH Test 1 Put a small amount of the unknown into DIW 2 Fill several vials with this test solution and use indicators to determine pH Begin with HBtB Common pHs pH 15 HSO4 present OH not present pH 25 SO42 present pH 335OH not present pH 56 NH4present pH 7 Cl andor N03 andor SO42 andor K andor Napresent pH 910 HSO4 OHnot present pH 1012 HSO4 NH4not present pH 13 OH present NH4 HSO4 not present IV NH4 Test 1 If the pH of the sample was acidic NH4 may be present 2 Place about 50 mL of sample solution in vial and add 50 mL of 1M NaOH to This will form NH3 if NH4 is present 3 If there is a strong smell and a new pH test indicated the solution is basic than NH3 is present and NH4 was present in the original sample V K Test Only if NH4 was confirmed by the above 1 Heat the unknown by placing a small portion of the solid unknown in an open crucible 2 Heat until no fumes or smoke are discharged and by testing with litmus paper 3 In small vial place remains of the crucible 4 Add 1 drop of 60M HAc and 23 drops of Cobaltnitrite reagent 5 If yellow percipitate forms K is present VI Cl Test 1 Place several drops of the sample solution in vial and add 10M HNO3 until solution is acidic test acidity with red litmus paper 2 Add one drop of 002M AgNO3 3 If cloudy precipitate forms then Cl is present v11 SO42HSO4 Test 1 Place several drops of sample solution in vial and add 10M HNO3 until solution is acidic test acidity with red litmus paper 2 Add one drop of 025M BaNO32 3 If cloudy percipitate forms then 804 is present 4 To distinguish between SO42 and HSO4 test pH VIII N03 Test 1 Place small crystal of FeOH26NH42SO42 in a spot plate 2 Cover crystal with a few drops of the sample solution 3 Immediately add 2 drops of 180M H2804 4 If brown solution forms N03 is present Possible Chemicals Cations K Na NH4 Anions C NO3 5042 HSO4 OH
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