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Visual evaluation of Ppy (dark precipitant) formation in solutions with different compositions, performed at 0.04 M concentration of [Fe(CN)6]3− or [Fe(CN)6]4− with 0.5 M of pyrrole.
| Sample No. | Compositions | Description of Result | ||
|---|---|---|---|---|
| Fe(CN)6]3− | [Fe(CN)6]4− | Pyrrole | ||
| 1 | 0.04 M | - | 0.5 M | Ppy was formed instantly |
| 2 | - | 0.04 M | 0.5 M | Ppy distinctly appeared only after 1–2 days |
