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These simple test tube reactions illustrate a number of the properties of complex ions and help to consolidate the idea of stability complexes.
Materials:
| 0.5 copper sulfate (2 cm3) | Concentrated hydrochloric acid (2 cm3) |
| 8 M ammonia (5 cm3) | 0.2 M edta (5 cm3) |
| 0.1 M sodium 2-hydroxybenzoate (2 cm3) | 0.1 M 1,2-dihydroxybenzene (2 cm3) |
| Test tubes (8) | Dropping pipettes |