Answered: What is the role of (NH4)2HPO4? Give…

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

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 14.6QAP: The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of...

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Concept explainers

Group 13 Elements

In the periodic table, group 13 elements exist in the first p-block. There are six elements present in group 13, which include boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and element 113 (ununtrium, (Uut)). Group 13 elements are also designated as the boron family.

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?

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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