Lab Report Assistant This document is not meant to be a substitute for a formal
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Lab Report Assistant
This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Exercise 1: Qualitative Anion Tests
Data Table 1. Anion Confirmation Tests.
Chemical
Anion
Addition of AgNO3
Addition of HCl
NaBr
Bromide
It became white and cloudy
Still was white and cloudy
Na2CO3
Carbonate
Clear inside white and cloudy around the outside
Still white and cloudy but bubbles start to form
NaCl
Chloride
Turn white cloudy on bottom clear on top
Still white cloudy on bottom clear on top
NaI
Iodide
In the middle very dark and cloudy fades out lighter white around the middle
Became a little separate
Na2SO4
Sulfate
Clear
Became white and cloudy
Na2S
Sulfide
Turn a brown color in the middle but separated from the clear
The brown becomes more separate from the clear
Unknown #103
CO3^2-
White and cloudy
Small particles
Bubbles form white and cloudy
Unknown #104
S^2-
Turn brown color I the middle around clear
Some of the brown disappeared and become separate
Flow chart:
Solution containing: Br-, CO3^2-, Cl-, I-, SO4^2-, and S^2-
{AgBr(cloudy), Ag2CO3(cloudy), AglCloudy),Agl(very dark), Ag2S-(brown)} {So4^2-}
{AgBr(cloudy), AgCl(cloudy), Agl(very cloudy), Ag2S(brown)} {CO3^2-(decomposes to give CO2 gas)}
Data Table 2. Cation Flame Tests.
Chemical
Cation
Flame Observations
KI
Potassium
LIGHT PINK
CaCl2
Calcium
RED
LiOH
Lithium
FUSHA PINK
NaCl
Sodium
ORANGE
Cu(NO3)2
Copper
TEAL
Unknown #105
TEAL
Unknown #106
LIGHT PINK
Unknown #107
RED
Data Table 3. Complete Chemical Identification.
Chemical
Cation
Anion Test Observations
Anion
Complete Chemical Name and Formula
Unknown #105
Unknown #106
Unknown #107
Chemical
Anion
Addition of AgNO3
Addition of HCl
NaBr
Bromide
It became white and cloudy
Still was white and cloudy
Na2CO3
Carbonate
Clear inside white and cloudy around the outside
Still white and cloudy but bubbles start to form
NaCl
Chloride
Turn white cloudy on bottom clear on top
Still white cloudy on bottom clear on top
NaI
Iodide
In the middle very dark and cloudy fades out lighter white around the middle
Became a little separate
Na2SO4
Sulfate
Clear
Became white and cloudy
Na2S
Sulfide
Turn a brown color in the middle but separated from the clear
The brown becomes more separate from the clear
Unknown #103
CO3^2-
White and cloudy
Small particles
Bubbles form white and cloudy
Unknown #104
S^2-
Turn brown color I the middle around clear
Some of the brown disappeared and become separate
Explanation / Answer
Complete Table 3. as shown below
Chemical
Cation
Anion Test Observations
Anion
Complete Chemical Name and Formula
#105 Copper with AgNO3: No change NO3^2- Copper(II)nitrate, Cu(NO3)2
#106 Potasssium with AgNO3: In the middle very I- Potassium iodide, KI
dark and cloudy fades out lighter
white around the middle
#107 Calcium With AgNO3: Turn white cloudy Chloride Calcium chloride, CaCl2
on bottom clear on top
Chemical
Cation
Anion Test Observations
Anion
Complete Chemical Name and Formula
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