pKa Learn

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The values you compare (answer choices in Learn, cards in Rank, protons in Most acidic) are at least 5 pKa units apart on Easy and 3 on Hard. Values below 0 or above 14 in water, and below 0 or above 35 in DMSO, are marked extrapolated: they cannot be measured directly in that solvent. Mixed questions are multiple choice until a card is familiar, then typed. A card is mastered after two correct answers in a row; progress is saved in this browser.