Group III CationsAl3+, (Cd2+), Co2+, Cr3+, Fe2+ and Fe3+, Mn2+,

Ni2+, Zn2+

Precipitated in 0.1 M H2S solution at pH 9Ions that form sulfides which are insoluble in

basic solution. The reagents are similar to these of the 2nd group, but separation is conducted at pH of 8–9

C-1

C-2

C-3

C-4

Red precipitate:Ni+2

C-5

Blue precipitate:Co+2

C-6

Yellow precipitate:Co+3

C-7

CasserolePorcelain, Casserole Dishhigh-temperature vessel for melting, ashing

or drying samples

C-8

C-9

Purple solution:Mn+2

C-10

Red solution:Fe+3

C-11

Blue solution:Fe+3

C-12

Red:Al+3

C-13 Yellow Precipitate: Cr+3

Gray-green precipitate: Zn+2

SourcesIntroduction to Qualitative Analysis

http://chemistry.about.com/library/weekly/aa091001a.htm

Porcelain, Casserole Dish, Laboratory Supplies

http://www.labdepotinc.com/Category_Details~id~304.aspx