This is my last question for this month can some please answer question 1 and 2. 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
Copper
TEAL
Unknown #106
Potassium
LIGHT PINK
Unknown #107
Calcium
RED
Data Table 3. Complete Chemical Identification.
Chemical
Cation
Anion Test Observations
Anion
Complete Chemical Name and Formula
Unknown #105
Copper
with AgNO3: No chane
No3^2-
Copper(II) nitrate, Cu(NO3)2
Unknown #106
Potassium
with AgNO3: In the middle very dark and cloudy fades out lighter white the middle
I-
Potassium iodide, KI
Unknown #107
Calcium
With AgNO3: Turn white cloudy on the bottom on top
Cl-
Calcium chloride, CaCl2
Questions
1. Use your results and observations in Data Tables 1, 2, and 3, to create a flow chart for the identification of an unknown (both an unknown anion and cation), using the AgNO3 and HCl confirmation tests and the cation flame tests.
2. If you were asked to confirm the identity of an unknown chemical as lithium sulfide (Li2S), describe the tests that you would use to confirm the identity. Use your results in both Exercise 1 and Exercise 2 to describe the observations in both the cation and anion tests that would allow the unknown to be confirmed as lithium sulfide.