Chapter 16: Acid-Base Equilibria Chemistry 1220 Notes A. Acids and Bases: Review a. Arrhenius acid - When dissolved in water, increase the concentration of H ions b. Arrhenius base- When dissolved in water, increases the - concentration of OH ions c. Can only be applied to aqueous solutions B. Brønsted-Lowry Acids and Bases a. Acid-base reactions involve the transfer of H ions from one substance to another b. Brønsted-Lowry acid – substance that donates a proton to another substance c. Brønsted-Lowry base – substance that accepts a proton d. Hydronium ion (H O )3– formed with the interaction of a proton with water e. A substance can only act as an acid if there is another substance acting as its base, and vise versa i. Acid and base always work together to transfer a proton f. Amphiprotic- substance capable of acting as either an acid or a base i. Acts as a base when combined with something more acidic than itself ii. Acts as an acid when combined with something more basic than itself iii. Autoionization- in pure water, a few molecules act as bases and a few act as acids g. Acid-Base equilibrium i. Both forward and reverse reactions involve proton transfer h. Conjugate acid-base pair- an acid and a base that differ only in the presence or absence of a proton i. Con

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Problem 20.2
You may have heard that “antioxidants” are good for your health. Is an “antioxidant” an oxidizing agent or a reducing agent? [Sections 20.1 and 20.2]

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