Experiment 9.2: General Reagents for Anions

1M AgNO3, 1M BaCl2, 6M HNO3

precipitating agents of anions

a. ppt forms (insoluble), b. no ppt forms

What happens when you add this to Group 1 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 1

Chlorine — Cl^-

Group 1

Bromine — Br^-

Group 1

Iodine — I^-

Group 1

Cyanide — CN^-

Group 1

Thiocyanate — SCN^-

Group 1

Ferrocyanide — Fe(CN)6^4-

Group 1

Ferricyanide — Fe(CN)6^3-

a. ppt forms (soluble), b. no ppt forms

What happens when you add this to Group 2 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 2

Sulfide — S^2-

Group 2

Nitrite — NO2^-

Group 2

Acetate — CH3COO^- or C2H3O2^-

a. white ppt forms (soluble), b. ppt forms (soluble)

What happens when you add this to Group 3 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 3

Sulfite — SO3^2-

Group 3

Carbonate — CO3^2-

Group 3

Bicarbonate — HCO3^-

Group 3

Borate — BO3^3-

Group 3

Oxalate — C2O4^2-

Group 3

Tartrate — C4H4O6^2-

Group 3

Citrate — C6H5O7^3-

a. colored ppt forms (soluble), b. ppt forms (soluble)

What happens when you add this to Group 4 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 4

Phosphate — PO4^3-

Group 4

Arsenite — AsO3^-

Group 4

Arsenate — AsO4^-

Group 4

Thiosulfate — S2O3^2-

Group 4

Chromate — CrO4^2-

a. no ppt b. no ppt

What happens when you add this to Group 5 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 5

Nitrate — NO3^-

Group 5

Chlorate — ClO3^-

a. no ppt formed, b. ppt forms (insoluble)

What happens when you add this to Group 6 anions: a. 1M AgNO3 and 6M HNO3 b. 1M BaCl2 and 6M HNO3

Group 6

Sulfate — SO4^2-

Group 6

Fluorine — F^-

white curdy ppt

Cl^- + 1M AgNO3 = AgCl

light yellow/cream ppt

Br^- + 1M AgNO3 = AgBr

canary yellow ppt

I^- + 1M AgNO3 = AgI

white ppt

CN^- + 1M AgNO3 = AgCN

white ppt

SCN^- + 1M AgNO3 = AgSCN

white ppt

Fe(CN)6^4- + 1M AgNO3 = Ag4[Fe(CN)6]

orange ppt

Fe(CN)6^3- + 1M AgNO3 = Ag3Fe(CN)6

black ppt

S^2- + 1M AgNO3 = Ag2S

white ppt

NO^2- + 1M AgNO3 = AgNO2

white crystalline ppt

CH3COO^- + 1M AgNO3 = AgCH3COO

white ppt

SO3^2- + 1M AgNO3 = Ag2SO3

white ppt

BO3^3- + 1M AgNO3 = Ag2BO3 to Ag2O

white ppt

CO3^- + 1M AgNO3 = Ag2CO3

white ppt

C2O4^2- + 1M AgNO3 = Ag2C2O4

white ppt

C4H4O6^2- + AgNO3 = Ag2C4H4O6

white ppt

C6H5O7^3- + 1M AgNO3 = Ag3C6H5O7

white ppt

SO3^2- + 1M BaCl = BaSO3

white ppt

BO3^3- + 1M BaCl = Ba(BO2)2

white ppt

CO3^2- + 1M BaCl = BaCO3

white ppt

C2O4^2- + 1M BaCl = BaC2O4

white ppt

C4H4O6^2- + 1M BaCl = BaC4H4O6

white ppt

C6H5O7^3- + 1M BaCl = Ba3C6H5O7

yellow ppt

PO4^3- + 1M AgNO3 = Ag3PO4

yellow ppt

AsO3^3- + 1M AgNO3 = Ag3AsO3

chocolate brown ppt

AsO4^3- + 1M AgNO3 = Ag3AsO4

brownish red ppt

CrO4^2- + 1M AgNO3 = Ag2CrO4

white to black ppt

S2O3^3- + 1M AgNO3 = Ag2S2O3 to Ag2S

white ppt

PO4^3- + 1M BaCl = Ba3(PO4)2

white ppt

AsO3^3- + 1M BaCl = Ba3(AsO3)2

white ppt

ASO4^3- + 1M BaCl = Ba3(AsO4)2

yellow ppt

CrO4^2- + 1M BaCl = BaCrO4

white ppt

S2O3^2- + 1M BaCl = BaS2O3

white ppt

SO4^-2 + BaCl2 = BaSO4

white ppt

F^- + BaCl2 = BaF2