hard · MCAT chem-phys
For a polyprotic titration, why does the second pK_a usually occur at a higher pH than the first pK_a?
- The first proton is always part of a stronger bond.
- Water becomes more basic as the titration proceeds.
- Removing a positively charged proton from an already negative ion is electrostatically unfavorable.
- The concentration of the acid decreases after the first dissociation.
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