Formulation with different NaOH concentrations.
| Group | Cu2+ (M) | PVP (g) | l-Ascorbic acid (M) | NaOH (M) |
|---|---|---|---|---|
| 1 | 0.37 | 0.25 | 0.5 | 0 |
| 2 | 0.37 | 0.25 | 0.5 | 0.25 |
| 3 | 0.37 | 0.25 | 0.5 | 0.5 |
| 4 | 0.37 | 0.25 | 0.5 | 0.75 |
| 5 | 0.37 | 0.25 | 0.5 | 1 |
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