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cation qualitative analysis - Coggle Diagram
cation qualitative analysis
add aqueous sodium hydroxide
white ppt. formed
insoluble in excess
Al3+
soluble in excess
Zn2+
green ppt. formed
Insoluble
Fe2+
light-blue ppt
soluble in excess to form dark blue solution
Cu2+
red-brown ppt. formed
insoluble in excess
Fe3+
no ppt. formed
Ca2+
no visible reaction
K+
Na+
add aqueous ammonia
no visible reaction
NH4+
Ca2+
green ppt formed, insoluble in excess
Fe2+
red-brown ppt formed, insoluble in excess
Fe3+
light blue ppt formed, soluble in excess to form dark blue solution
Cu2+
white ppt formed
soluble and forms a colourless solution
Zn2+
insoluble
Al3+