Acid-Base and Gas-Evolution Reactions

Write the net ionic equation by eliminating the spectator ions, those that do not change during the reaction. 

Consider this reaction occurring in aqueous solution. 

Write a complete ionic equation and net ionic equation for the reaction. 

Even though coffee itself is acidic overall, it oontains some naturally occurring bases (such as caffeine) that give it a bitter taste. 

Two other kinds of reactions that occur in solution are acid-base reactions—reactions that form water upon mixing of an acid and a base— and gas evolution reactions— reactions that evolve a gas. Like precipitation reactions, these reactions occur when the cation of one reactant combines with the anion of another. As we will see in the next section, many gas evolution reactions also happen to be acid-base reactions. 

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Kindergarten Volcanoes, Automobiles, and Laundry Detergents 205 7.5 Aqueous Solutions and Solubility Compounds Dissolved in Water 214 7.8 7.9 Acid-Base and Gas Evolution Reactions 223 Oxidation-Reduction... 

Two other important classes of reactions that occur in aqueous solution are acid-base reactions and gas-evolution reactions. In an acid-base reaction (also called a neutralization reaction), an acid reacts with a base and the two neutralize each other, producing water (or in some cases a weak electrolyte). In a gas-evolution reaction, a gas forms, resulting in bubbling. In both cases, as in precipitation reactions, the reactions occur when the anion from one reactant combines with the cation of the other. Many gas-evolution reactions are also acid-base reactions. 

Throughout this chapter, we have examined different types of chemical reactions. We have seen examples of precipitation reactions, acid-base reactions, gas evolution reactions, oxidation-reduction reactions, and combustion reactions. We can organize these different t)q>es of reactions with the following flowchart. 

This double-displacement reacton is also a gas evolution reaction and an acid-base reaction. 

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