Use the information in the pictures if needed and solve for the unknown D. please type the answers because it is much easier for me to understand that way. Unknown D To the unknown mixture, 3 drops of 6 M HCl was added and no precipitate formed. To the liquid that was left, 3 drops of 0.10M (NH4)2SO4 was added and a precipitate formed. The precipitate was isolated by centrifuging and the liquid from the top decanted for further testing. To the decanted liquid, the solution was made basic and a few drops of (NH4)2C2O4 was added. No precipitate formed. The liquid was tested for Mg2+ and a bright blue jelly ppt formed. To the unknown, a separate NH4+ test was done and the litmus paper used to test the pH turned blue. To the unknown, a flame test was performed and the color emitted was a light purple-red. What ions are in the unknown? (Identify unknown ions and provide a brief summary) DO NOT SIMPLY RESTATE THE ABOVE OBSERVATIONS.
Use the information in the pictures if needed and solve for the unknown D. please type the answers because it is much easier for me to understand that way. Unknown D To the unknown mixture, 3 drops of 6 M HCl was added and no precipitate formed. To the liquid that was left, 3 drops of 0.10M (NH4)2SO4 was added and a precipitate formed. The precipitate was isolated by centrifuging and the liquid from the top decanted for further testing. To the decanted liquid, the solution was made basic and a few drops of (NH4)2C2O4 was added. No precipitate formed. The liquid was tested for Mg2+ and a bright blue jelly ppt formed. To the unknown, a separate NH4+ test was done and the litmus paper used to test the pH turned blue. To the unknown, a flame test was performed and the color emitted was a light purple-red. What ions are in the unknown? (Identify unknown ions and provide a brief summary) DO NOT SIMPLY RESTATE THE ABOVE OBSERVATIONS.
Chapter12: Spectrochemical Methods
Section: Chapter Questions
Problem 15P
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Use the information in the pictures if needed and solve for the unknown D.
please type the answers because it is much easier for me to understand that way.
Unknown D
To the unknown mixture, 3 drops of 6 M HCl was added and no precipitate formed. To the liquid that was left, 3 drops of 0.10M (NH4)2SO4 was added and a precipitate formed. The precipitate was isolated by centrifuging and the liquid from the top decanted for further testing. To the decanted liquid, the solution was made basic and a few drops of (NH4)2C2O4 was added. No precipitate formed. The liquid was tested for Mg2+ and a bright blue jelly ppt formed.
To the unknown, a separate NH4+ test was done and the litmus paper used to test the pH turned blue.
To the unknown, a flame test was performed and the color emitted was a light purple-red. What ions are in the unknown?
(Identify unknown ions and provide a brief summary)
DO NOT SIMPLY RESTATE THE ABOVE OBSERVATIONS.
Transcribed Image Text:Qualitative Analysis of Ag*, Pb²+, Hg,²+ Ba?+, Ca²+, Mg2+, NH,, K*, Na* ions
I. Objective:
To identify Ag*, Pb2+, Hg,²+ Ba²+, Ca2+, Mg²+, NH4", K*, Na* ions in an unknown.
II. Observations:
The chemical tests are outlined in the lab manual. Below is a summary of chemical
tests 1-9 that would be performed in lab. The outcomes of the chemical tests have been
highlighted in grey.
Table 1: Summary of observations
C20,2| Mg2+
(ox)
lons
HCI
Heated
NH3
Cro2
SO,2-
NH4+
Flame
test tube+CrO4²-
test
test
test
1
4
5
7
8
Ag*
White White
PPT
Red-
White N/A
N/A
-----
ppt
ppt
Dissolves brown
ppt
stays.
White Ppt
dissolves. Yellow white
ppt
Yellow
Pb2+
Bright Stays
White White |N/A
N/A
ppt
ppt
ppt
ppt
ppt
ppt
White N/A
Hg22+ | White White
ppt stays
N/A
Black
Orange
N/A
ppt
N/A
ppt
White White N/A
ppt
ppt
N/A
Ba2+
N/A
N/A
ppt
ppt
White N/A
Ca2+
N/A
N/A
N/A
N/A
N/A
ppt
Mg2+
N/A
N/A
N/A
N/A
Blue
N/A
ppt
N/A
Na+
N/A
N/A
N/A
N/A
N/A
Bright
orange
Lt.purple/
dark
K+
N/A
N/A
N/A
N/A
N/A
N/A
-------
purple-
red
NH4+
N/A
N/A
N/A
N/A
N/A
Litmus
blue
Transcribed Image Text:STEP 9
spedal
Ag*, Hg,", Pb*, Ca**, Mg**, Na", K*, Ba*, NH"
NH34)
test for
NHy*
STEP 1
ADD HCI
2, Mg
Agclis)
Hg2 Cals)
Pbl2 (s)
Bat,
Nat, Catz
k* (a4)
+2
) ADD H20
STEP 2
ADD
2) Heat
STEP 6
Hg2Clz
Aac
t2
Pb
BaSoy (s)
you have Batz
|Mg", Na",
(a)
ca² , K+
ADD
STEP 3
ADD
NH3
STEP 4
POCrou
) make pH=8
) ADD INHU). CGO,
STEP 7
you have
Pb+2
|CaC204
Mg", Na", K* (aa)
you have
you have Cat2
Split in
2 test tubes
STEP 5
ADD HNO3
+2
you have Ag*
Magnesium
Blue Lake
Test
Flame
Test
STEP 8
Nat
yellow orange
fiame
Flame
Test
Purple
flame
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