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Published byErnest Gibbs Modified over 8 years ago
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Reactions in Aqueous Solution Chapter 9 Section 3
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Reactions in Aqueous Solutions Aqueous Solution – one or more substances (solutes) dissolved in water (solvent) Types of reactions Reactions that form precipitates Reactions that form water Reactions that form gases
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Reactions that form Precipitates Two aqueous solutions that when mixed together form one solid, based on solubility rules 2 NaOH (aq) + CuCl 2 (aq) 2 NaCl (aq) + Cu(OH) 2 (s)
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Ionic Equations Complete Ionic equation – an ionic equation that shows all of the particles in a solution as they exist Spectator Ions – ions that do not participate in the reaction Net ionic equation – ionic equations that include only the particles that participate in the reaction
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Example Aqueous solutions of potassium iodide and silver nitrate are mixed forming a precipitate of silver iodide. Chemical Equation KI (aq) + AgNO 3 (aq) KNO 3 (aq) + AgI (s) Complete Ionic Equation K + (aq) + I - (aq) + Ag + (aq) + NO 3 - (aq) K + (aq) + NO 3 - (aq) + AgI (s) Net Ionic Equation I - (aq) + Ag + (aq) AgI (s)
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Write the complete and net ionic equations for the following LiI (aq) + AgNO 3 (aq) AgI (s) + LiNO 3 (aq) BaCl 2 (aq) + K 2 CO 3 (aq) BaCO 3 (s) + 2 KCl (aq) Aq solns of aluminum chloride and sodium hydroxide are mixed, forming the precipitate aluminum hydroxide. Aq solns of lithium sulfate and calcium nitrite are mixed forming the precipitate calcium sulfate,
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Reactions that form water No observable evidence of a chemical reaction because water is colorless HBr (aq) + NaOH (aq) H 2 O (l) + NaBr (aq)
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Write the complete and net ionic equations for the following Sulfuric acid and aq potassium hydroxide produce water and aq potassium sulfate Hydrochloric acid and aq calcium hydroxide produce water and aq calcium chloride Hydrosulfuric acid and aq calcium hydroxide produces water and aq calcium sulfate
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Reactions that form gases When two aqueous solns combine and produce a gas 2 HI (aq) + Li 2 S (aq) H 2 S (g) + 2 LiI (aq)
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Write the complete and net ionic equations for the following Perchloric acid reacts with aq potassium carbonate forming carbon dioxide gas and water Sulfuric acid reacts with aq sodium cyanide forming hydrogen cyanide gas and aq sodium sulfate Hydrochloric acid reacts with zinc metal to form hydrogen gas and aq zinc chloride
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Overall Equations When the product of one reaction is unstable and immediately reacts again to form a new product When you combine hydrochloric acid and sodium hydrogen carbonate a double-replacement and decomposition reaction take place
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Overall Reactions Reaction 1 HCl (aq) + NaHCO 3 (aq) H 2 CO 3 (aq) + NaCl (aq) Reaction 2 H 2 CO 3 (aq) H 2 O (l) + CO 2 (g) Combined Equation HCl (aq) + NaHCO 3 (aq) + H 2 CO 3 (aq) H 2 CO 3 (aq) + NaCl (aq) + H 2 O (l) + CO 2 (g) Overall Equation HCl (aq) + NaHCO 3 (aq) NaCl (aq) + H 2 O (l) + CO 2 (g)
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Solubility Rules for Ionic Compounds in Water Soluble All nitrates are soluble Group 1 cations and NH 4 + ions form soluble salts Most halides are soluble, except those of Pb 2+, Hg 2 2+, Ag +, and Cu + Most sulfates are soluble, with the exceptions of those of Ba 2+, Sr 2+ and Pb 2+, Hg 2 2+, Ag +, and Ca 2+ form slightly soluble sulfates Insoluble Hydroxides, oxides, and sulfides are usually insoluble, except for those of group 1 ions and NH 4 + are soluble and those of group 2 are slightly soluble Chromates, phosphates, and carbonates are usually insoluble, except for those of group 1 ions and NH 4 + are soluble.
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