How to Calculate Complex Ion
What is Complex Ion?
Complex ions form from metal cation + ligands; stability described by formation constant K_f (larger K_f = stronger complex).
Step-by-Step Guide
- 1Input metal ion, ligands, and stability constants
- 2Calculate complex formation extent
- 3Determine free metal concentration
Worked Examples
Input
[Cu(NH₃)₄]²⁺: K_f ≈ 10¹³ (very stable)
Result
Even at high pH, ammonia prevents Cu²⁺ precipitation
Common Mistakes to Avoid
- ✕Not accounting for overall K_f
- ✕Neglecting multi-step formation
Frequently Asked Questions
How does complexation affect solubility?
Forms complex more soluble than precipitate; common use to dissolve otherwise insoluble salts.
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