Saltanalysis
From WikiEducator
Tests for aqueous cations
| cation | effect of aqueous sodium hydroxide | effect of aqueous ammonia |
|---|---|---|
| aluminium (Al 3+) |
white ppt., soluble in excess giving a colourless solution |
white ppt., insoluble in excess |
|
ammonium (NH4+) |
ammonia produced on warming | – |
| calcium (Ca2+) | white ppt., insoluble in excess | no ppt. or very slight white ppt. |
| copper (Cu2+) | light blue ppt., insoluble in excess |
light blue ppt., soluble in excess, giving a dark blue solution |
| iron(II) (Fe2+) | green ppt., insoluble in excess | green ppt., insoluble in excess |
| iron(III) (Fe3+) | red-brown ppt., insoluble in excess | red-brown ppt., insoluble in excess |
| zinc (Zn2+) |
white ppt., soluble in excess, giving a colourless solution |
white ppt., soluble in excess, giving a colourless solution |
