What is the role of (NH4)2HPO4? Give the balanced chemical equations for the reactions of Group IV cations with (NH4)2HPO4

Fundamentals Of Analytical Chemistry
9th Edition
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Chapter17: Complexation And Precipitation Reactions And Titrations
Section: Chapter Questions
Problem 17.34QAP
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  1. What is the role of (NH4)2HPO4? Give the balanced chemical equations for the reactions of Group IV cations with (NH4)2HPO4.
  2. Why was HCl added for the flame test of barium?
  3. What comprises Group IV Cations? 
  4. Can precipitation give a positive test for this group? Why?

Chem 4a Expt 2-Qualitative Analysis for Group IV Cations
I. Objective:
To confirm the presence of Group IV cations using flame test.
II. Observations and Results:
A. Precipitation of Group IV cations:
a. What is the role of (NH4)2HPO4? Give the balanced chemical equations for the reactions of Group IV
cations with (NH4)2HPO4.
b. Why was Hd added for the flame test of barium?
c. KNOWN SAMPLE
Group IV
Positive observation
cations
2+
Ва
2+
Sr
Ca2+
Mg2*
d.
UNKNOWN SAMPLE
Unknown 1
Unknown 2
2+
Ba
Sr 2+
Ca2+
Mg2*
e. Account for your UNKNOWN sample. Are all of the Group IV cations present in your sample? Explain
why.
Additional questions:
1.What comprises Group IV Cations?|
2.Can precipitation give a positive test for this group? Why?
II. Conclusion.
Transcribed Image Text:Chem 4a Expt 2-Qualitative Analysis for Group IV Cations I. Objective: To confirm the presence of Group IV cations using flame test. II. Observations and Results: A. Precipitation of Group IV cations: a. What is the role of (NH4)2HPO4? Give the balanced chemical equations for the reactions of Group IV cations with (NH4)2HPO4. b. Why was Hd added for the flame test of barium? c. KNOWN SAMPLE Group IV Positive observation cations 2+ Ва 2+ Sr Ca2+ Mg2* d. UNKNOWN SAMPLE Unknown 1 Unknown 2 2+ Ba Sr 2+ Ca2+ Mg2* e. Account for your UNKNOWN sample. Are all of the Group IV cations present in your sample? Explain why. Additional questions: 1.What comprises Group IV Cations?| 2.Can precipitation give a positive test for this group? Why? II. Conclusion.
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