Flame Test Experiment

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter22: Bulk Electrolysis: Electrogravimetry And Coulometry
Section: Chapter Questions
Problem 22.9QAP
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Flame Test Experiment

Procedures
#
1
2
3
4
5
Data & Results
5669
7
8
1.
2.
3.
10
4.
5.
Fill the test tubes with 5-10 drops of each metal ion solution.
Dip a wire loop into a metal ion solution (or remove a pre-soaked wood splint).
Hold the wire loop in the Bunsen burner flame and observe the color of the flame
Record your observations in the data table. If using wood splints avoid catching them
on fire.
Be sure the loop is clean for the next sample (no more flame color)
Option: Watch the flame through a diffraction grading slide to see the bright-line
emission spectrum.
11
12
13
14
Compound Name
or Any Available
Compound
MgCl
Zinc SO4
Lead Nitrate
5% Fe C13
NAOH
5% CuSO4
Barium Cl
Na Iodide
Aluminum
K2CQ
1% KMnO4
NH4C1
10% NaC1
10% Pb Acetate
Compound
Formula
Metal Ion
Color of
the
Solution
Flame
Color
Observation
Transcribed Image Text:Procedures # 1 2 3 4 5 Data & Results 5669 7 8 1. 2. 3. 10 4. 5. Fill the test tubes with 5-10 drops of each metal ion solution. Dip a wire loop into a metal ion solution (or remove a pre-soaked wood splint). Hold the wire loop in the Bunsen burner flame and observe the color of the flame Record your observations in the data table. If using wood splints avoid catching them on fire. Be sure the loop is clean for the next sample (no more flame color) Option: Watch the flame through a diffraction grading slide to see the bright-line emission spectrum. 11 12 13 14 Compound Name or Any Available Compound MgCl Zinc SO4 Lead Nitrate 5% Fe C13 NAOH 5% CuSO4 Barium Cl Na Iodide Aluminum K2CQ 1% KMnO4 NH4C1 10% NaC1 10% Pb Acetate Compound Formula Metal Ion Color of the Solution Flame Color Observation
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Analysis:

  1. What is an ion?
  2. Describe what happens to the electrons in an atom when they absorb energy (from the flame)?  Why does this produce a bright-line emission spectrum (rather than a continuous spectrum)?
  3. In terms of atomic structure, why does each metal ion produce a different color flame?
  4. What difficulties are there in identifying metal ions with a flame test?  How could you improve the specific identification of the metal ions during a flame test?
  5. If it can be determined from the flame test results, what are the identities of the two unknown liquids?
  6. What might be some practical (and exciting) applications of metal containing compounds that create different colors of light while burning?  Explain.
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Follow-up Question

What is Flame Test?

What is your observations about this flame test experiment?

What is your own conclusion about this experiment? 

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Follow-up Question

What do you think is the problem why do we need to do the flame test experiment?

What is the purpose of the flame test experiment?

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