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...
Related questions
Question
- What is the role of (NH4)2HPO4? Give the balanced chemical equations for the reactions of Group IV cations with (NH4)2HPO4.
- Why was HCl added for the flame test of barium?
- What comprises Group IV Cations?
-
Can precipitation give a positive test for this group? Why?

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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