Illustrated Guide to Home Chemistry Experiments

346 DIY Science: Illustrated Guide to Home Chemistry Experiments

TABLE 19-5: Qualitative analysis of inorganic cations—observed data

CationH 2 SO 4 (3 M) HCl naOH nH 3 K 3 [Fe(Cn) 6 ] K 4 [Fe(Cn) 6 ] KSCn

ExampleWhite ppt; not soluble in

excess ammonia

White ppt; not soluble

in excess HCl; soluble in

excess ammonia; re-ppt’d

by excess nitric acid

Black ppt; not soluble in

excess NaOH; soluble in

excess ammonia; re-ppt’d

by excess nitric acid

Black ppt; soluble in excess

ammonia; re-ppt’d by

excess nitric acid

Al3+

Ag+

Ba2+

Ca2+

Co2+

Cr3+

Cu2+

Fe2+

Fe3+

Mn2+

ni3+

Pb2+

Sr2+

zn2+