High school10 min

Brønsted acids and bases: pairs, Ka and pKa

Spot an acid/base pair, write a reaction as a proton transfer and tell from the pKa values whether it is favoured.

The essentials

1

Brønsted acid and base

An acid is a species able to donate a proton HX+\ce{H+}; a base is a species able to accept one. An acid-base reaction is a proton transfer from the acid of one pair to the base of another pair.
2

Conjugate acid/base pair

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3

Ionic product of water

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4

Acid dissociation constant and pKa

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5

Predominant species

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ƒWrite my own sheetOr start from a blank page: rewriting a concept in your own words is how it sticks.