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Stoichiometry of Chemical Reactions

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Stoichiometry of Chemical Reactions ( stoichiometry-chemical-reactions )

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Chapter 4 Stoichiometry of Chemical Reactions 189 Solution (a) The two reactants are provided, HOCl and H2O. Since the substance is reported to be an acid, its reaction with water will involve the transfer of H+ from HOCl to H2O to generate hydronium ions, H3O+ and hypochlorite ions, OCl−. HOCl(aq) + H2 O(l) ⇌ OCl−(aq) + H3 O+(aq) A double-arrow is appropriate in this equation because it indicates the HOCl is a weak acid that has not reacted completely. (b) The two reactants are provided, Ba(OH)2 and HNO3. Since this is a neutralization reaction, the two products will be water and a salt composed of the cation of the ionic hydroxide (Ba2+) and the anion generated when the acid transfers its hydrogen ion (NO3 −). Ba(OH)2(aq) + 2HNO3(aq) ⟶ Ba(NO3)2(aq) + 2H2 O(l) Check Your Learning Write the net ionic equation representing the neutralization of any strong acid with an ionic hydroxide. (Hint: Consider the ions produced when a strong acid is dissolved in water.) Answer: H3 O+(aq) + OH−(aq) ⟶ 2H2 O(l) Link to Learning Explore the microscopic view (http://openstaxcollege.org/l/16AcidsBases) of strong and weak acids and bases. Oxidation-Reduction Reactions Earth’s atmosphere contains about 20% molecular oxygen, O2, a chemically reactive gas that plays an essential role in the metabolism of aerobic organisms and in many environmental processes that shape the world. The term oxidation was originally used to describe chemical reactions involving O2, but its meaning has evolved to refer to a broad and important reaction class known as oxidation-reduction (redox) reactions. A few examples of such reactions will be used to develop a clear picture of this classification. Some redox reactions involve the transfer of electrons between reactant species to yield ionic products, such as the reaction between sodium and chlorine to yield sodium chloride: 2Na(s) + Cl2(g) ⟶ 2NaCl(s) It is helpful to view the process with regard to each individual reactant, that is, to represent the fate of each reactant in the form of an equation called a half-reaction: 2Na(s) ⟶ 2Na+(s) + 2e− Cl2(g) + 2e− ⟶ 2Cl−(s) These equations show that Na atoms lose electrons while Cl atoms (in the Cl2 molecule) gain electrons, the “s” subscripts for the resulting ions signifying they are present in the form of a solid ionic compound. For redox reactions of this sort, the loss and gain of electrons define the complementary processes that occur:

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