Suppose an unknown sample only contains Pb2+ and Cr3+ ions, but no other Group 2 cations....
Suppose an unknown sample only contains Pb2+ and Cr3+ ions, but no other Group 2 cations. If an aqueous sample of this unknown is treated with NH4OH followed by NaOH, which observation will be true?
| A. |
a white precipitate will form, but the Pb2+ and Cr3+ ions will still make up a mixture |
|
| B. |
a clear solution will be obtained, but the Pb2+ and Cr3+ ions still make up a mixture |
|
| C. |
a blue-green gel will be produced, and the Pb2+ and Cr3+ ions will be effectively separated |
|
| D. |
a pink colloidal suspension will be obtained, and the Pb2+ and Cr3+ ions will be effectively separated |
Homework Answers
C OPTION IS CORRECT BECAUSE CHROMIUM HYDROXIDE IS A BLUE GREEN GEL AND LEAD HYDROXIDE WILL BE WHITE PPT THEY BOTH CAN BE EFFECTIVELY SEPERATED USING CENTRIFUGATION
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Suppose an unknown
sample only contains Pb2+ and
Cr3+ ions, but no other Group 2 cations....
I concluded that my unknown was Pb2+. since yellow precipitate formed. can you help me answer...
I concluded that my unknown was Pb2+. since yellow
precipitate formed. can you help me answer the questions for the
Known and unknown report
Qualitative Analysis: Group I Cations 10 ORECTIVES A Leam some chemistry of Group I cations, R Analyze an unknown for Group I cations. THEORY AND DISCUSSION Group I cations are precipitated as insoluble chlorides: Ag, Pb, Hg2 +Cr-AgCl, PbCh, HgCla The colors of the following species will be helpful in the analysis for Group I cations....
48 Group III Cations Scheme Fo”, Ni, Cr", Alto 3% H2O2 (Step 3) 6M NaOH (Step...
48 Group III Cations Scheme Fo”, Ni, Cr", Alto 3% H2O2 (Step 3) 6M NaOH (Step 4) Heat (Step 5) Fe(OH). (brown solid) NI(OH) (green solid) (Black solid, Step 6) Croi (Al(OH) (Yellow solution, Step 6) 1 15M HNO, (Step 7) 1M NHACI (Step 8) 15M NH,OHNH, (Step 9)/Spin (Step 10) 15M HNO, (Step 14) GM NH,OHNH, (Step 15) Fe(OH) (Brown solid Step 10) INIINHA (Blue solution Step 10) Al(OH) White gel Step 16) Cro. (Yellow solution Step 16) 1...
1. If your original unknown is colorless, what ions are absent from your unknown? 2. If...
1. If your original unknown is colorless, what ions are absent
from your unknown?
2. If you get no precipitate with just the 6 M NH3 in step B,
what ions are absent from your unknown?
pls help are my answers correct ty
17 Page 4 Aperiment 24. Qualitative Analysis Group III-NI, Mn, Fe, Al, Cr, Zn 1. PROCEDURES A. Observations of Samples. Obtain an unknown and record code. Observe color of unknown solution Common color correlations are: dark blue...
Group III dry lab: Refer to the procedures in your lab manual. Fill in the blanks...
Group III dry lab: Refer to the procedures in your lab manual. Fill in the blanks and complete the questions on the next page FeN2.C.AP 3% H., (Step 3) 6M N OH (Step 4) Heat (Step 5) Fe(OH), (brown solid) Ni(OH)(green solid) (Black solid, Step 6) CO2. JANON (Yellow solution, Step) 1 15M HNO, (Step 7) IM NHACI (Step 8) 15M NH,OH/NH, (Step 9)/Spin (Step 10) 15M HINO, (Step 14) 6M NILOHNH. (Step 15) . fe AKOH) White gel Step...
Question: Procedure Separation and Identification of Pb2 (aq), Fe (aq), Al(a), and Cu Note: Tests should...
Question:
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3. Suppose after adding HCl to ppt 16, you do not have any black solid. What,...
3. Suppose after adding HCl to ppt 16, you do not have any black solid. What, if anything, should you do to test for Co2 and Ni*? Qual Scheme: Group III: Co?(pink), N1" (green), Fet+ (yellow), Cr" (blue-grey), Mn(pink), AP (colorless), Zn? (colorless). Unknown B Solution: Use 10 dps of unknown sample and 10 dps of H20 and go to Procedure for Group III. Procedure for Group II: Add 2 dps NHCl soln, add 6M NHOH until just basic to...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you obser after completing the halide test, and what would that observation lead you to conclude? Organic Laboratory Technique Primer Sodium Fusions and lon Testing Background: The elements that commonly occur in organic compounds along with carbon, hydrogen, and oxygen, are: nitrogen sulfur, and the halogens. The detection of these latter three elements depends on converting them into water soluble lons (CNS , and X...
For the preparation and standardization of NaOH with KHP im supposed to boil water for 1hr and 30 min to remove CO2
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I concluded that my unknown was Pb2+. since yellow
precipitate formed. can you help me answer the questions for the
Known and unknown report
Qualitative Analysis: Group I Cations 10 ORECTIVES A Leam some chemistry of Group I cations, R Analyze an unknown for Group I cations. THEORY AND DISCUSSION Group I cations are precipitated as insoluble chlorides: Ag, Pb, Hg2 +Cr-AgCl, PbCh, HgCla The colors of the following species will be helpful in the analysis for Group I cations....
48 Group III Cations Scheme Fo”, Ni, Cr", Alto 3% H2O2 (Step 3) 6M NaOH (Step 4) Heat (Step 5) Fe(OH). (brown solid) NI(OH) (green solid) (Black solid, Step 6) Croi (Al(OH) (Yellow solution, Step 6) 1 15M HNO, (Step 7) 1M NHACI (Step 8) 15M NH,OHNH, (Step 9)/Spin (Step 10) 15M HNO, (Step 14) GM NH,OHNH, (Step 15) Fe(OH) (Brown solid Step 10) INIINHA (Blue solution Step 10) Al(OH) White gel Step 16) Cro. (Yellow solution Step 16) 1...
1. If your original unknown is colorless, what ions are absent
from your unknown?
2. If you get no precipitate with just the 6 M NH3 in step B,
what ions are absent from your unknown?
pls help are my answers correct ty
17 Page 4 Aperiment 24. Qualitative Analysis Group III-NI, Mn, Fe, Al, Cr, Zn 1. PROCEDURES A. Observations of Samples. Obtain an unknown and record code. Observe color of unknown solution Common color correlations are: dark blue...
Group III dry lab: Refer to the procedures in your lab manual. Fill in the blanks and complete the questions on the next page FeN2.C.AP 3% H., (Step 3) 6M N OH (Step 4) Heat (Step 5) Fe(OH), (brown solid) Ni(OH)(green solid) (Black solid, Step 6) CO2. JANON (Yellow solution, Step) 1 15M HNO, (Step 7) IM NHACI (Step 8) 15M NH,OH/NH, (Step 9)/Spin (Step 10) 15M HINO, (Step 14) 6M NILOHNH. (Step 15) . fe AKOH) White gel Step...
Question:
Procedure Separation and Identification of Pb2 (aq), Fe (aq), Al(a), and Cu Note: Tests should be performed concurrently on the known and the unknown solutions. Volumes are approximate. All work excepting the centrifugation should be done in the fume hood 1. To about 2. mL of your sample in a test tube, add 5 drops (-0.2 mL) of 6 M HCl(a). Mix well and centrifuge. Decant the clear liquid into a clean test tube and save it for Step...
3. Suppose after adding HCl to ppt 16, you do not have any black solid. What, if anything, should you do to test for Co2 and Ni*? Qual Scheme: Group III: Co?(pink), N1" (green), Fet+ (yellow), Cr" (blue-grey), Mn(pink), AP (colorless), Zn? (colorless). Unknown B Solution: Use 10 dps of unknown sample and 10 dps of H20 and go to Procedure for Group III. Procedure for Group II: Add 2 dps NHCl soln, add 6M NHOH until just basic to...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
d. Suppose you mistakenly acidify the filtrate with HCl instead of with HNO3. What would you obser after completing the halide test, and what would that observation lead you to conclude? Organic Laboratory Technique Primer Sodium Fusions and lon Testing Background: The elements that commonly occur in organic compounds along with carbon, hydrogen, and oxygen, are: nitrogen sulfur, and the halogens. The detection of these latter three elements depends on converting them into water soluble lons (CNS , and X...
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