Che 131 Notes Ch. 5

Che 131 Notes Ch. 5 - Che 131 Notes Chapter 5: Chemical...

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Che 131 Notes Chapter 5: Chemical Reactions Lecture 33: Reactions in Aqueous Solutions Reading: 5.1-5.3 I. 5.1 Exchange Reactions: Precipitations and Net Ionic Equations A. Aqueous Solubility of Ionic Compounds 1. strong electrolyte : an ionic compound that completely dissociates into its ions when dissolved in water B. Precipitation Reactions 1. precipitate : an insoluble product 2. an exchange reaction between two aqueous solutions will occur if a precipitate can form C. Net Ionic Equations 1. spectator ions : ions of the product that does not precipitate in a reaction, and remains in solution as reactants, after the reaction a. can be left out of the equation 2. net ionic equation : an equation that includes only the symbols or formulas of ions in solution or compounds that undergo change II. 5.2 Acids, Bases, and Acid-Base Exchange Reactions A. Acid: any substance that increases the concentration of H + when dissolved in pure water 1. H + : a proton a. Cannot exist in water alone i. Very small, positively charged Interacts strongly with O atoms of water molecules Combines with H 2 O to form hydronium ion H 3 O + 2. strong acids : acids that are entirely converted to ions when dissolved in water a. i.e. hydrochloric acid HCl, sulfuric acid H 2 SO 4 , Nitric acid HNO 3 , Perchloric acid HClO 4 , Hydrobromic acid HBr, Hydroiodic acid HI 3. strong electrolytes : ionic compounds (salts or strong bases) or molecular compounds that are strong acids and ionize completely in aqueous solution 4. weak electrolytes : acids and bases that ionize only slightly and establish equilibrium with water a. weak acids : acids that are only partially ionized in aqueous solution i. i.e. acetic acid CH 3 COOH(aq) ↔ H + (aq) + CH 3 COO - (aq) double arrow is a characteristic of weak electrolytes they est. a dynamic equilibrium in solution between the formation of the ions and their undissociated molecular form
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This note was uploaded on 10/13/2008 for the course CHE 131 taught by Professor Kerber during the Fall '08 term at SUNY Stony Brook.

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Che 131 Notes Ch. 5 - Che 131 Notes Chapter 5: Chemical...

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