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Prelab Group A Questions-Answer these questions on this page. 1. Explain why adding a slight excess of hydrochloric acid insures more complete precipitation of the Group A cations, but a large excess should not be used. 2. What is the purpose of washing the precipitate with hot water in step 3(a) of the procedure? Be as specific as possible in your answer. 3. For an unknown solution that contains at least one of the Group A cations, answer the following questions. (a) Upon adding 6 M HCl to the unknown solution, a white precipitate forms. What cation(s) may be present in the unknown? (b) When the white precipitate from (a) is treated with hot water, a white precipitate and colorless supernatant result. Adding KI(aq) to the colorless supernatant results in no reaction. What conclusion can be made about the presence or absence of the cations present in the unknown? (c) When the precipitate from (b) is treated with 6 M NH3(aq), it dissolves. If HNO3 were then added to the resulting solution, what would you expect to observe? Give the balanced net ionic equation, including phase symbols, for the reaction that occurs upon addition of the HNO3. Prelab Group A Flowchart- In your lab notebook, rewrite and complete the flow diagram below for Group A analysis. For each step, indicate the chemical form of each Group A cation that is present at the given step (for example Ag+, AgCl, Ag(NH3)2+, etc.). Also indicate colors of solutions and precipitates where known. snt = supernatant ppt = precipitate A = heat snt 1 M KI ppt water, A Ag+, Pb2+, Groups B, C, D 6 M HCI ppt 6 M NH3 6 M HNO 3 snt

Prelab Group A Questions-Answer these questions on this page. 1. Explain why adding a slight excess of hydrochloric acid insures more complete precipitation of the Group A cations, but a large excess should not be used. 2. What is the purpose of washing the precipitate with hot water in step 3(a) of the procedure? Be as specific as possible in your answer. 3. For an unknown solution that contains at least one of the Group A cations, answer the following questions. (a) Upon adding 6 M HCl to the unknown solution, a white precipitate forms. What cation(s) may be present in the unknown? (b) When the white precipitate from (a) is treated with hot water, a white precipitate and colorless supernatant result. Adding KI(aq) to the colorless supernatant results in no reaction. What conclusion can be made about the presence or absence of the cations present in the unknown? (c) When the precipitate from (b) is treated with 6 M NH3(aq), it dissolves. If HNO3 were then added to the resulting solution, what would you expect to observe? Give the balanced net ionic equation, including phase symbols, for the reaction that occurs upon addition of the HNO3. Prelab Group A Flowchart- In your lab notebook, rewrite and complete the flow diagram below for Group A analysis. For each step, indicate the chemical form of each Group A cation that is present at the given step (for example Ag+, AgCl, Ag(NH3)2+, etc.). Also indicate colors of solutions and precipitates where known. snt = supernatant ppt = precipitate A = heat snt 1 M KI ppt water, A Ag+, Pb2+, Groups B, C, D 6 M HCI ppt 6 M NH3 6 M HNO 3 snt

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Prelab Group A Questions-Answer these questions on this page. 1. Explain why adding a slight excess of hydrochloric acid insures more complete precipitation of the Group A cations, but a large excess should not be used. 2. What is the purpose of washing the precipitate with hot water in step 3(a) of the procedure? Be as specific as possible in your answer. 3. For an unknown solution that contains at least one of the Group A cations, answer the following questions. (a) Upon adding 6 M HCl to the unknown solution, a white precipitate forms. What cation(s) may be present in the unknown? (b) When the white precipitate from (a) is treated with hot water, a white precipitate and colorless supernatant result. Adding KI(aq) to the colorless supernatant results in no reaction. What conclusion can be made about the presence or absence of the cations present in the unknown? (c) When the precipitate from (b) is treated with 6 M NH3(aq), it dissolves. If HNO3 were then added to the resulting solution, what would you expect to observe? Give the balanced net ionic equation, including phase symbols, for the reaction that occurs upon addition of the HNO3.
Transcribed Image Text:Prelab Group A Questions-Answer these questions on this page. 1. Explain why adding a slight excess of hydrochloric acid insures more complete precipitation of the Group A cations, but a large excess should not be used. 2. What is the purpose of washing the precipitate with hot water in step 3(a) of the procedure? Be as specific as possible in your answer. 3. For an unknown solution that contains at least one of the Group A cations, answer the following questions. (a) Upon adding 6 M HCl to the unknown solution, a white precipitate forms. What cation(s) may be present in the unknown? (b) When the white precipitate from (a) is treated with hot water, a white precipitate and colorless supernatant result. Adding KI(aq) to the colorless supernatant results in no reaction. What conclusion can be made about the presence or absence of the cations present in the unknown? (c) When the precipitate from (b) is treated with 6 M NH3(aq), it dissolves. If HNO3 were then added to the resulting solution, what would you expect to observe? Give the balanced net ionic equation, including phase symbols, for the reaction that occurs upon addition of the HNO3.
Prelab Group A Flowchart- In your lab notebook, rewrite and complete the flow diagram below for Group A analysis. For each step, indicate the chemical form of each Group A cation that is present at the given step (for example Ag+, AgCl, Ag(NH3)2+, etc.). Also indicate colors of solutions and precipitates where known. snt = supernatant ppt = precipitate A = heat snt 1 M KI ppt water, A Ag+, Pb2+, Groups B, C, D 6 M HCI ppt 6 M NH3 6 M HNO 3 snt
Transcribed Image Text:Prelab Group A Flowchart- In your lab notebook, rewrite and complete the flow diagram below for Group A analysis. For each step, indicate the chemical form of each Group A cation that is present at the given step (for example Ag+, AgCl, Ag(NH3)2+, etc.). Also indicate colors of solutions and precipitates where known. snt = supernatant ppt = precipitate A = heat snt 1 M KI ppt water, A Ag+, Pb2+, Groups B, C, D 6 M HCI ppt 6 M NH3 6 M HNO 3 snt
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