2: Reduction Potentials of Metal Ions in Biology
- Page ID
- 148489
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- 2.5: Hard & Soft Acid & Base Considerations
- The principle of hard and soft acids and bases (HSAB) is useful here. Remember, this is a classification system that is based on the amount of charge density on acids and bases. Small ions with tightly held charges are called "hard". Larger, more polarisable ions are called "soft". Typically, hard cations (hard acids) combine more readily with hard anions (hard bases). Soft bases combine readily with soft acids.