Acid base - Learning Objectives Equilibrium and Acidity...

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Learning Objectives Describe what acid constants represent (e.g. K a , pK a ) and what their relative sizes mean for a particular acid/base reaction (i.e. a compound with larger K a is more acidic than one with a lower K a ) Define strong and weak acids/bases (Arrhenius, Brønsted-Lowry, Lewis acid/base theories) Draw conjugate bases and acids of chemical species Acids and Bases: Definitions Definitions Brönsted-Lowry definition acid : a proton donor base : a proton acceptor Lewis (1923) definition acid : an electron pair acceptor base : an electron pair donor conjugate acid base acid conjugate base Strong acids have weak conjugate bases Weak acids have strong conjugate bases Equilibrium and Acidity • the larger the K A , the stronger the Brönsted acid (the more easily it gives it a proton) This shows that the pK a value of a molecule is equal to the pH at which it is half ionized. The pKa is a very useful parameter…see the information sheet Ùnderstanding pH and pKa
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Acid base - Learning Objectives Equilibrium and Acidity...

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