Stoichiometry of Chemical Reactions

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Stoichiometry of Chemical Reactions ( stoichiometry-chemical-reactions )

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186 Chapter 4 Stoichiometry of Chemical Reactions Figure 4.5 When hydrogen chloride gas dissolves in water, (a) it reacts as an acid, transferring protons to water molecules to yield (b) hydronium ions (and solvated chloride ions). The nature of HCl is such that its reaction with water as just described is essentially 100% efficient: Virtually every HCl molecule that dissolves in water will undergo this reaction. Acids that completely react in this fashion are called strong acids, and HCl is one among just a handful of common acid compounds that are classified as strong (Table 4.2). A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a weak acid is acetic acid, the main ingredient in food vinegars: CH3 CO2 H(aq) + H2 O(l) ⇌ CH3 CO2 −(aq) + H3 O+(aq) When dissolved in water under typical conditions, only about 1% of acetic acid molecules are present in the ionized form, CH3 CO2 − (Figure 4.6). (The use of a double-arrow in the equation above denotes the partial reaction aspect of this process, a concept addressed fully in the chapters on chemical equilibrium.) This content is available for free at http://cnx.org/content/col11760/1.9

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