scotty 14 - Chemistry 15 Notes 15.2 The Nature of Acids and...

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Chemistry 15 Notes 15.2: The Nature of Acids and Bases Acids have the following general properties: a sour taste, low pH, corrosive, contain H + , ability to dissolve many metals, ability to turn blue litmus paper red, and the ability to neutralize bases. o Acaetic aid is an example of a carboxylic acid, an acid containing the following grouping: Often found in substances derived from living organisms and also include citric acid and malic acid. Bases have the following general properties: bitter taste, slippery feel, high pH, contain OH - , ability to turn red litmus paper blue, and the ability to neutralize acids. o Less common in foods because of bitterness. Aversion to taste of bases is probably an evolutionary adaptation to warn us against alkaloids, organic bases found in plants that are often poisonous (ex: coniine the active component of hemlock). Some foods such as coffee and chocolate (esp. dark) contain small amounts of base. o Bases feel slippery b/c they react with oils on the skin to form soap-like substances. 15.3: Definitions of Acids and Bases In the 1880s, Swedish chemist Svante Arrhenius proposed the following molecular definitions of acids and bases known as the Arrhenius definition. o Acid: A substance that produces H + ions in aqueous solution. Ex: HCl is an acid b/c it produces H + ions in solution. o Base: A substance that produces OH - ions in aqueous solution. Ex: NaOH is a base b/c it produces OH - ions in solution. o The H 3 O + ion is called the hydronium ion and in water. It just means an H + ion solvated in water. H
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This note was uploaded on 04/01/2011 for the course CHEMISTRY 2400 taught by Professor Staff during the Fall '10 term at Georgia State.

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scotty 14 - Chemistry 15 Notes 15.2 The Nature of Acids and...

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