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This is a good test of observational skill.
Materials:
| 1 M sodium hydroxide (20 cm3) | 2 M ammonia (20 cm3) |
| 0.1 M chromium(III) chloride (5 cm3) | 0.1 M manganese(II) sulfate (5 cm3) |
| 0.1 M iron(II) sulfate (5 cm3) | 0.1 M iron(III) chloride (5 cm3) |
| 0.1 M nickel(II) sulfate (5 cm3) | 0.1 M copper(II) sulfate (5 cm3) |
| 0.1 M zinc sulfate (5 cm3) | |
| Test tubes (14) and rack | Dropping pipettes |