You have a solution that may contain up to two of the following 4 cations: Ag+,...
You have a solution that may contain up to two of the following 4 cations: Ag+, Pb2+, Cu2+, Ni2+. The initial solution is clear and blue. Upon adding NaCl, a white precipitate forms. You centrifuge and decant the solution, and heat the portion where the white precipitate is. Heating causes the white precipitate to dissolve.
To the supernatant liquid, which is still blue, you add ammonia, resulting in a deep blue color. Which cations are present?
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You have a solution that may contain up to two of the following
4 cations: Ag+,...
Ex: Separation of Group 1 Cations (Pb+ and Ag+) 10 drops of unknown was place along...
Ex: Separation of Group 1 Cations (Pb+ and Ag+) 10 drops of unknown was place along with 6 drops of 6M HCl, centrifuge. 2 more drops of 6M HCl, centrifuge. Decant supernate, use precipitate and add 5 drops of cold water, centrifuge. Test for Pb2+ 15 drops of water to precipitate & put in hot water, centrifuge then decant supernate. repeat x2 Combine supernates and save precipitate for Ag+ analysis. Add 3 drops of 1M K2CrO4 to supernate. yellow precipitate...
Which cation or cations may be present in a pale blue solution that turns deep blue...
Which cation or cations may be present in a pale blue solution that turns deep blue and forms a white precipitate upon addition of 6 M NH3(aq)?
Cations Nat, Pb2+, Ag+, Ni²+, Cr3, Zn, Mg2+ Keep track of any descriptions. (e.g. NP First do Na is green) flame te...
Cations Nat, Pb2+, Ag+, Ni²+, Cr3, Zn, Mg2+ Keep track of any descriptions. (e.g. NP First do Na is green) flame test Then add source I of Cl(e.g. HCI) Supernatant (solution) Solid precipitate i.e. ppt or P Ni?", Cr3+, Zn²+, Mg2+ PbCl2, AgCl Hot H2O Solid Try adding stuff to see what Solution happens!! (Follow your lab manual) Pb2+, Cl- Na2SO4 l or Nal PbSO4 Pbl2 ppt white ppt Very yellow AgCl (white) Figure 4 Qualitative Analysis 130
14. A solution which contains only one of the following cations: Ag+, Pb2+, or Cut is...
14. A solution which contains only one of the following cations: Ag+, Pb2+, or Cut is tested with various reagents and the following results are obtained: Reagent Result 0.2M NaCl Precipitate 0.2 M Na2SO4 No Precipitate 0.2 M NaNO3 No precipitate a) Which cation does the solution contain? b) Explain why each of the other two ions is not the ion in the solution.
QUESTIONS Which of the following reactions are metathesis reactions? (a) 2KciO3 2KCI+302 (b) Cu(NO3)2+ZnCu+Zn(NO,)2 (e) BaCOs...
QUESTIONS Which of the following reactions are metathesis reactions? (a) 2KciO3 2KCI+302 (b) Cu(NO3)2+ZnCu+Zn(NO,)2 (e) BaCOs + 2 HCBaCl2 +H20+Co2 (d) Na2CO, +Cuso Na,SO,+CuCO 1. 2a. How many grams of each of the following substances will dissolve in 100 mL of cold water? Consult a handbook or the Internet and cite your source. Ce(lO3)4 RaSO4 Pb(NO) (NH)SeO 2b. Which of these substances is least soluble on a gram-per-100 mL basis? 3. Suppose you have a solution that might contain any...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an Unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample should be identified first if it is indeed in the sample? 2. In what phase is the first cation supposed to be identified, in solid or liquid phase? And in what color? 3. According to the experimental procedure written above which cation in your sample should be identified second if it is indeed in the sample? 4. In what phase is the second cation...
Suppose you have an unknown clear, colorless solution. In attempt to identify it, you add NaOH...
Suppose you have an unknown clear, colorless solution. In attempt to identify it, you add NaOH dropwise and find that a white gelatinous precipitate forms, but when more NaOH was added the precipitate dissolved again. To another test tube of the same unknown solution is added AgNO3 dropwise, and a white precipitate forms. What salt most likely comprises the unknown solution? Explain your reasoning (3 points) 2. Suppose you have a different unknown solution that you know to be 50/50...
3. a. What happens in Part Fl if conc NaOH is substituted for conc NH4OH? b....
3. a. What happens in Part Fl if conc NaOH is substituted for conc NH4OH? b. What happens to the precipitate in Part F1 if conc HCl is added? 3. Dissolve the Cu2+ and Bil Sulfides. Add 15 drops of 6 M HNO3 to the precipitate from Part E.2 and carefully heat with a direct flame until the precipitates dissolve. (Caution: make sure the test tube is pointed away from all other students while heating). Cool and centrifuge. Save the...
Group 1 Flowchart Use the following chemical facts to construct a flow chart for this lab:...
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...
Cations Nat, Pb2+, Ag+, Ni²+, Cr3, Zn, Mg2+ Keep track of any descriptions. (e.g. NP First do Na is green) flame test Then add source I of Cl(e.g. HCI) Supernatant (solution) Solid precipitate i.e. ppt or P Ni?", Cr3+, Zn²+, Mg2+ PbCl2, AgCl Hot H2O Solid Try adding stuff to see what Solution happens!! (Follow your lab manual) Pb2+, Cl- Na2SO4 l or Nal PbSO4 Pbl2 ppt white ppt Very yellow AgCl (white) Figure 4 Qualitative Analysis 130
14. A solution which contains only one of the following cations: Ag+, Pb2+, or Cut is tested with various reagents and the following results are obtained: Reagent Result 0.2M NaCl Precipitate 0.2 M Na2SO4 No Precipitate 0.2 M NaNO3 No precipitate a) Which cation does the solution contain? b) Explain why each of the other two ions is not the ion in the solution.
QUESTIONS Which of the following reactions are metathesis reactions? (a) 2KciO3 2KCI+302 (b) Cu(NO3)2+ZnCu+Zn(NO,)2 (e) BaCOs + 2 HCBaCl2 +H20+Co2 (d) Na2CO, +Cuso Na,SO,+CuCO 1. 2a. How many grams of each of the following substances will dissolve in 100 mL of cold water? Consult a handbook or the Internet and cite your source. Ce(lO3)4 RaSO4 Pb(NO) (NH)SeO 2b. Which of these substances is least soluble on a gram-per-100 mL basis? 3. Suppose you have a solution that might contain any...
QUESTION 1 The procedure for testing your unknown solution in this week's lab is identical to the procedure which you conducted in Week 1. The only difference is, of course, your Unknown Solution may or may not contain all of the ions which you tested for in Week 1. With that being said, please consider the following scenario: You enter the lab and obtain an Unknown Solution from the Stockroom. You begin testing the solution through the steps outlined in...
PRE-LABORATORY QUESTIONS NAME: 1. According to the experimental procedure written above which cation in your sample should be identified first if it is indeed in the sample? 2. In what phase is the first cation supposed to be identified, in solid or liquid phase? And in what color? 3. According to the experimental procedure written above which cation in your sample should be identified second if it is indeed in the sample? 4. In what phase is the second cation...
Suppose you have an unknown clear, colorless solution. In attempt to identify it, you add NaOH dropwise and find that a white gelatinous precipitate forms, but when more NaOH was added the precipitate dissolved again. To another test tube of the same unknown solution is added AgNO3 dropwise, and a white precipitate forms. What salt most likely comprises the unknown solution? Explain your reasoning (3 points) 2. Suppose you have a different unknown solution that you know to be 50/50...
3. a. What happens in Part Fl if conc NaOH is substituted for conc NH4OH? b. What happens to the precipitate in Part F1 if conc HCl is added? 3. Dissolve the Cu2+ and Bil Sulfides. Add 15 drops of 6 M HNO3 to the precipitate from Part E.2 and carefully heat with a direct flame until the precipitates dissolve. (Caution: make sure the test tube is pointed away from all other students while heating). Cool and centrifuge. Save the...
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...
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