Unknown Analysis Flashcards
(Anion) + _ drop of Ba(NO3)2
1
(Anion) + 1 drop of ________
Ba(NO3)2
(Anion) + 1 drop of Ba(NO3)2 = white ppt: ____, ____, ____
Carbonate CO3 2-
Phospahte PO4 3-
Sulfate SO4 2-
(Anion) + 1 drop of Ba(NO3)2 = no ppt: ____, ____, ____, ____
Iodine I-
Bromine Br-
Thiocyanate SCN-
Nitrate NO3-
What do I add if no ppt (anion)?
(+) 2 drops 1 M HNO3
(+) 3 drops 0.1 M FE(NO3)3
(+) 5 toluene
(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: (visible reaction) yellow
Bromine (Br)
(+) 2:3:5 ratio
Toluene Layer: pink
Aqueous Layer: pink
Iodine (I)
(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: blod red complex
Thiocyanate (SCN)
(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: colorless
NItrate (NO3)
What to add which is 1:5 in ratio (anion)?
(+) 1 drop 0.01 M (acidified) KMnO4
(+) 5 drops toluene
If KMnO4 is not yet acidified, what do you add?
(+) 2 drops 1 M HNO3
(+) 1 drop KMnO4
(+) 1:5 ratio
Toluene Layer: yellow
Aqueous Layer: yellow brown
Bromine (Br)
(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene
(+) 1:5 ratio
Toluene Layer: pink
Aqueous Layer: yellow brown
Iodine (I)
(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene
(+) 1:5 ratio
Toluene Layer: colorless
Aqueous Layer: peach
Toluene Layer: colorless
Aqueous Layer: yellow
Thiocyanate (SCN)
Nitrate (NO3)
(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene
For white ppt anions CO3 2-, PO4 3-, SO4 2-, what do you DO?
Let settle and decant ppt.
Once you decant CO3 2-, PO4 3-, SO4 2-, what do you ADD?
1 M Acetic Acid (CH3COOH)
dropwise!
(+) 1 M Acetic Acid dropwise: Precipitate dissolves WITH bubbles, then it is _______
CO3 (Carbonate)
(+) 1 M Acetic Acid dropwise: Precipitate dissolves WITHOUT bubbles, then it is _______
PO4 (Phosphate)
(+) 1 M Acetic Acid dropwise: Precipitate DOES NOT dissolve and white ppt remains, then it is _______
SO4
(+) 2:3:5 ratio
Pinkish-red Toluene Layer: _________
Iodine (I)
(+) 2:3:5 ratio
Deep Red Aqueous solution: ________
Thiocyanate (SCN)
(+) 1:5 ratio
Yellow or orange toluene layer: ________
Bromine (Br)
For NO3-, what is the 3:6 ratio?
(+) 3 drops 6 M H2SO4
(+) 6 drops FeSO4
Then, mix!
In NO3-, what to do after adding 3:6 and mixing?
Tilt test tube 60 degrees
(+) 3 drops 18 M H2SO4
In NO3-, what to do after adding 3:6 and mixing? After ‘Tilt test tube 60 degrees’ and ‘(+) 3 drops 18 M H2SO4’?
DO NOT SHAKE.
Tilt upright SLOWLY.
Observe brown ring.
