Chem Lab Midterm Flashcards
Anion Group #1 precipitating agent
Calcium Acetate Ca(Ac)2
Negatively charged ions produced by the ionization of salts and acids
Anions
#1 Produces vigorous effervescence
Carbonate HCO3
#1 White precipitate
Sulfite
Added to Oxalate to make the pink color disappear
KMnO4
Arsenite + thioacetamide =
Yellow precipitate
Arsenate + KI
Brown solution
Added to phosphate that creates a yellow precipitate
Ammonium molybdate
Name the reagents of the following Group 1 anions: Carbonate Fluoride Sulfite Oxalate Arsenate Arsenite Phosphate
KClO3 H2SO4 H2O2 KMnO4 KI Thioacetamide Ammonium molybdate
What happens to these Group #1 anions when their reagents are added? •HCO3 •F •SO3 • C2O4 •AsO3 •AsO4 •PO4
- vigorous effervescence
- etching of glass
- white ppt
- disappearance of pink color
- yellow precipitate
- brown solution color
- yellow precipitate
Anion Group #2 precipitating agent
Barium Acetate Ba(Ac)2
What will happen to the following Group #2 anions when their reagents are added?
• SO4
•CrO4
- white precipitate
* yellow precipitate
What are the reagents added to the following Group #2 anions?
• SO4
• CrO4
- HCl
* NaAc
Precipitating agent of Group #3 anions
Cadmium Acetate Cd(Ac)2
What are the reagents added to the following group #3 anions?
• Sulfide
•Ferrocyanide
• Ferricyanide
- Pb(Ac)2
- Ferrous Sulfate Crystals
- FeCl2
What happens to the following Group #3 anions when their reagents are added?
• Sulfide
• Ferricyanide
• Ferrocyanide
- Brown/ Black coloration of filter paper
- Dark Blue Precipitate
- Dark Blue precipitate
What is the precipitating agent of Group #4 anions?
Ag(Ac)2
What happens to the following Group #4 anions when their reagents are added?
• Thiocyanate
• Chloride
• Thiosulfate
- red coloration
- white precipitate
- white-yellow-orange-brown-black precipitate
What are the reagents of the following Group# 4 anions?
• SCN
•Cl
•S2O3
- FeCl2
- HNO3
- HNO3
What is the precipitating agent of Group #5 anions?
NONE
What are the reagents added to the following Group #5 anions? • Chlorate •Nitrite •Nitrate •Borate • Iodide
•NaNo2 • Urea in HCl • a-naphthylamine H2SO4 • Carminic Acid • NaNo3
What happens to the following Group #5 anions when their reagents are added? • ClO3 •NO2 •NO3 • BO3 • I
- white precipitate
- vigorous gas evolution
- purple ring
- brown ring
- red-bluish violet
- violet color in CCl4
What are the Group #2 anions?
Sulfate
Chromate
What are the group #4 anions?
Thiocyanate
Chloride
Thiosulfate
What are the Group #3 anions?
Sulfide
Ferrocyanide
Ferricyanide
What are the Group#1 anions?
Carbonate Fluoride Sulfite Oxalate Phosphate Arsenate Arsenite
What are the Group#5 anions?
Chlorate Nitrite Nitrate Borate Iodide
